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| | | <ElementDefenition> The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph a </ElementReferences> |
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| | | <ElementDefenition> Represents the sum of a) The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance, and b) the excess of the estimated liabilities for claims and claim costs over the consideration received for retroactive reinsurance contracts as of the balance sheet date. </ElementDefenition> |
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| | | <ElementDefenition> Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-5 -Paragraph 10 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 21, 22, 23, 24, 25 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 17, 18, 19, 20 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph b Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 </ElementReferences> |
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| | | <IsEPS> false </IsEPS> |
| | | <Label> Net balance at beginning of year </Label> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Amount of provision in the period for claims incurred in the reporting period and related claims settlement costs. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph b </ElementReferences> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ElementDefenition> Amount of provision in the period for claims incurred in prior reporting periods and related claims settlement costs. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph b </ElementReferences> |
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| | | <ElementDefenition> Total provision in the period for claims incurred and costs incurred in the claim settlement process. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph b </ElementReferences> |
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| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -6905000000 </NumericAmount> |
| <RoundedNumericAmount> -6905000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Amount of payments made in the reporting period to settle claims incurred in the current period and related claims settlement costs. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph c </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Current accident year </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 14 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole/> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
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| <RoundedNumericAmount> -9191000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -8315000000 </NumericAmount> |
| <RoundedNumericAmount> -8315000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -8486000000 </NumericAmount> |
| <RoundedNumericAmount> -8486000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Amount of payments made in the reporting period to settle claims incurred in prior periods and related claims settlement costs. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph c </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Prior accident years </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 15 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> totallabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -16857000000 </NumericAmount> |
| <RoundedNumericAmount> -16857000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -15522000000 </NumericAmount> |
| <RoundedNumericAmount> -15522000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -15391000000 </NumericAmount> |
| <RoundedNumericAmount> -15391000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Total amount of payments made during the reporting period to settle insured claims and pay costs incurred in the claims settlement process. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b </ElementReferences> |
| | | <IsTotalLabel> true </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Total payments </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 16 </Id> |
| | | <IsAbstractGroupTitle> true </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_UnpaidLossesActivityAbstract </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Other </Unit> |
| | | <ElementDataType> xbrli:stringItemType </ElementDataType> |
| | | <SimpleDataType> string </SimpleDataType> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Unpaid losses and loss adjustment expenses: </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 17 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseBeforeForeignCurrencyAndAcquisitionAdjustmentsNet </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of... </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 53767000000 </NumericAmount> |
| <RoundedNumericAmount> 53767000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 52216000000 </NumericAmount> |
| <RoundedNumericAmount> 52216000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 49744000000 </NumericAmount> |
| <RoundedNumericAmount> 49744000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims but before adjustments for foreign currency and acquisitions. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Net balance at end of year </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 18 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_ReinsuranceRecoverablesAndDeferredCharges </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> Represents the sum of a) The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims... </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> true </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> periodendlabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 6545000000 </NumericAmount> |
| <RoundedNumericAmount> 6545000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 6879000000 </NumericAmount> |
| <RoundedNumericAmount> 6879000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 7133000000 </NumericAmount> |
| <RoundedNumericAmount> 7133000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Represents the sum of a) The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance, and b) the excess of the estimated liabilities for claims and claim costs over the consideration received for retroactive reinsurance contracts as of the balance sheet date. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Ceded losses and deferred charges at end of year </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 19 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyTranslation </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> Reflects the net gain (loss) from converting unpaid claims and claims adjustments of consolidated entities which are stated... </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -312000000 </NumericAmount> |
| <RoundedNumericAmount> -312000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 232000000 </NumericAmount> |
| <RoundedNumericAmount> 232000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> -616000000 </NumericAmount> |
| <RoundedNumericAmount> -616000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Reflects the net gain (loss) from converting unpaid claims and claims adjustments of consolidated entities which are stated in a foreign currency into the currency used in the financial statements. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Foreign currency translation adjustment </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 20 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAcquisitions </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> Reflects the net adjustment to liability for unpaid cliams and claims adjustment expense as a result of acquisitions. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 75000000 </NumericAmount> |
| <RoundedNumericAmount> 75000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 89000000 </NumericAmount> |
| <RoundedNumericAmount> 89000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 359000000 </NumericAmount> |
| <RoundedNumericAmount> 359000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Reflects the net adjustment to liability for unpaid cliams and claims adjustment expense as a result of acquisitions. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Acquisitions </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 21 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> true </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> periodendlabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 60075000000 </NumericAmount> |
| <RoundedNumericAmount> 60075000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 59416000000 </NumericAmount> |
| <RoundedNumericAmount> 59416000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 56620000000 </NumericAmount> |
| <RoundedNumericAmount> 56620000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph a </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Gross liabilities at end of year </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 22 </Id> |
| | | <IsAbstractGroupTitle> true </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_NarrativeAbstract </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole/> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> false </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Other </Unit> |
| | | <ElementDataType> xbrli:stringItemType </ElementDataType> |
| | | <SimpleDataType> string </SimpleDataType> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Narrative [Abstract] </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 23 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseOpeningBalanceAdjustments </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole/> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 2626000000 </NumericAmount> |
| <RoundedNumericAmount> 2626000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 1507000000 </NumericAmount> |
| <RoundedNumericAmount> 1507000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 1690000000 </NumericAmount> |
| <RoundedNumericAmount> 1690000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Sum of adjustments to the estimated reserve for unpaid claims and claims adjustment expense. </ElementDefenition> |
| | | <ElementReferences> Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph a </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Incurred losses adjustment </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 24 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_AmortizationOfDeferredChargesReinsuranceAssumed </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> Amount of deferred charge amortization for retroactive reinsurance contracts incepting prior to the current period. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 261000000 </NumericAmount> |
| <RoundedNumericAmount> 261000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 504000000 </NumericAmount> |
| <RoundedNumericAmount> 504000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
| <NumericAmount> 451000000 </NumericAmount> |
| <RoundedNumericAmount> 451000000 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <CurrencyCode/> |
| <CurrencySymbol/> |
| <IsIndependantCurrency> false </IsIndependantCurrency> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <DisplayDateInUSFormat> false </DisplayDateInUSFormat> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Amount of deferred charge amortization for retroactive reinsurance contracts incepting prior to the current period. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | <IsEPS> false </IsEPS> |
| | | <Label> Amortization charges for prior accident years' losses </Label> |
| | | </Row> |
| | <Row> |
| | | <Id> 25 </Id> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <Level> 0 </Level> |
| | | <ElementName> brka_DiscountedWorkersCompensationLiabilities </ElementName> |
| | | <ElementPrefix> brka </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ShortDefinition> Discounted workers' compensation reserve amount. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsEquityPrevioslyReportedAsRow> false </IsEquityPrevioslyReportedAsRow> |
| | | <IsEquityAdjustmentRow> false </IsEquityAdjustmentRow> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsReverseSign> false </IsReverseSign> |
| | | <PreferredLabelRole> terselabel </PreferredLabelRole> |
| | | <FootnoteIndexer/> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <IsNumeric> true </IsNumeric> |
| <IsRatio> false </IsRatio> |
| <DisplayZeroAsNone> false </DisplayZeroAsNone> |
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| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
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| | | <ElementPrefix> brka </ElementPrefix> |
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| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| <ExchangeRateRoundingLevel> UnKnown </ExchangeRateRoundingLevel> |
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