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| <CurrencyCode> USD </CurrencyCode> |
| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
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| | | <CurrencySymbol> $ </CurrencySymbol> |
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| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Equity index put options [Member]"/> |
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| | | <hasScenarios> false </hasScenarios> |
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| <KeyName> {us-gaap_StatementBusinessSegmentsAxis} : Finance and Financial Products [Member] {us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis} : Equity index put options [Member] 1/1/2008 - 12/31/2008 USD ($) </KeyName> |
| <CurrencySymbol> $ </CurrencySymbol> |
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| <EntitySchema> http://www.sec.gov/CIK </EntitySchema> |
| <EntityValue> 0001067983 </EntityValue> |
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| <Schema> http://xbrl.org/2006/xbrldi </Schema> |
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| <CurrencyCode> USD </CurrencyCode> |
| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
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| | | <CurrencySymbol> $ </CurrencySymbol> |
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| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Equity index put options [Member]"/> |
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| | | <CurrencyCode> USD </CurrencyCode> |
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| | | <hasSegments> true </hasSegments> |
| | | <hasScenarios> false </hasScenarios> |
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| <KeyName> {us-gaap_StatementBusinessSegmentsAxis} : Finance and Financial Products [Member] {us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis} : Credit default obligations [Member] 1/1/2010 - 12/31/2010 USD ($) </KeyName> |
| <CurrencySymbol> $ </CurrencySymbol> |
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| <EntityValue> 0001067983 </EntityValue> |
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| <CurrencyCode> USD </CurrencyCode> |
| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
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| | | <CurrencySymbol> $ </CurrencySymbol> |
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| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Credit default obligations [Member]"/> |
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| | | <CurrencyCode> USD </CurrencyCode> |
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| | | <hasSegments> true </hasSegments> |
| | | <hasScenarios> false </hasScenarios> |
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| <KeyName> {us-gaap_StatementBusinessSegmentsAxis} : Finance and Financial Products [Member] {us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis} : Credit default obligations [Member] 1/1/2009 - 12/31/2009 USD ($) </KeyName> |
| <CurrencySymbol> $ </CurrencySymbol> |
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| <ContextID> Pri_12mos_20091231_CreditRiskContractMember_FinanceAndFinancialProductsMember </ContextID> |
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| <EntityValue> 0001067983 </EntityValue> |
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| <ValueName> Finance and Financial Products [Member] </ValueName> |
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| <ValueName> Credit default obligations [Member] </ValueName> |
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| <CurrencyCode> USD </CurrencyCode> |
| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
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| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Credit default obligations [Member]"/> |
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| | | </Column> |
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| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <LabelColumn> false </LabelColumn> |
| | | <CurrencyCode> USD </CurrencyCode> |
| | | <FootnoteIndexer/> |
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| | | <hasScenarios> false </hasScenarios> |
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| <KeyName> {us-gaap_StatementBusinessSegmentsAxis} : Finance and Financial Products [Member] {us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis} : Credit default obligations [Member] 1/1/2008 - 12/31/2008 USD ($) </KeyName> |
| <CurrencySymbol> $ </CurrencySymbol> |
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| <ValueName> Credit default obligations [Member] </ValueName> |
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| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
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| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Credit default obligations [Member]"/> |
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| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
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| | | <hasScenarios> false </hasScenarios> |
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| <KeyName> {us-gaap_StatementBusinessSegmentsAxis} : Finance and Financial Products [Member] {us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis} : Other [Member] 1/1/2010 - 12/31/2010 USD ($) </KeyName> |
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| <dimensionId> us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis </dimensionId> |
| <type> explicitMember </type> |
| </DimensionInfo> |
| </anyType> |
| </Segments> |
| <Scenarios/> |
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| <UnitProperty> |
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| <UnitType> Standard </UnitType> |
| <StandardMeasure> |
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| <MeasureNamespace> iso4217 </MeasureNamespace> |
| </StandardMeasure> |
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| </UnitProperty> |
| </UPS> |
| <CurrencyCode> USD </CurrencyCode> |
| <OriginalCurrencyCode> USD </OriginalCurrencyCode> |
| </MCU> |
| | | <CurrencySymbol> $ </CurrencySymbol> |
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| <Label Id="1" Label="12 Months Ended"/> |
| <Label Id="2" Label="Dec. 31, 2008"/> |
| <Label Id="3" Label="Finance and Financial Products [Member]"/> |
| <Label Id="4" Label="Other [Member]"/> |
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| | </Columns> |
| <Rows> |
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| | | <IsAbstractGroupTitle> true </IsAbstractGroupTitle> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
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| | | <PeriodType> duration </PeriodType> |
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| | | <IsReportTitle> false </IsReportTitle> |
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| | | <IsBeginningBalance> false </IsBeginningBalance> |
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| | | <FootnoteIndexer/> |
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| | | <Unit> Other </Unit> |
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| | | <SimpleDataType> string </SimpleDataType> |
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| | | <IsTotalLabel> false </IsTotalLabel> |
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| | | <ElementDefenition> Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
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| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> The cash inflow associated with derivative instruments. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | | <Label> Proceeds from Derivatives </Label> |
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| | | <ElementPrefix> brka </ElementPrefix> |
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| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> The cash outflow associated with derivative instruments. </ShortDefinition> |
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| | | <ElementDefenition> The cash outflow associated with derivative instruments. </ElementDefenition> |
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| | | <PeriodType> duration </PeriodType> |
| | | <ShortDefinition> Aggregate notional amount of unwound derivatives. </ShortDefinition> |
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| </Cells> |
| | | <OriginalInstanceReportColumns/> |
| | | <Unit> Monetary </Unit> |
| | | <ElementDataType> xbrli:monetaryItemType </ElementDataType> |
| | | <SimpleDataType> monetary </SimpleDataType> |
| | | <ElementDefenition> Aggregate notional amount of unwound derivatives. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | | <Label> Notional value of unwound derivatives </Label> |
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| | </Rows> |
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| <NumberOfRows> 5 </NumberOfRows> |
| <ReportName> Derivative contracts - gains and losses (Detail) (USD $) </ReportName> |
| <MonetaryRoundingLevel> NoRounding </MonetaryRoundingLevel> |
| <SharesRoundingLevel> UnKnown </SharesRoundingLevel> |
| <PerShareRoundingLevel> UnKnown </PerShareRoundingLevel> |
| <ExchangeRateRoundingLevel> UnKnown </ExchangeRateRoundingLevel> |
| <HasCustomUnits> false </HasCustomUnits> |
| <SharesShouldBeRounded> true </SharesShouldBeRounded> |
| </InstanceReport> |