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| | | <Label> Changes in unrecognized amounts of pension and retiree medical benefits, net of tax of $(1,872) for the year ended Dec. 31, 2007; $(11,986) for the year ended Dec. 31, 2008; and $(2,203) for the year ended Dec. 31, 2009 </Label> |
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| | | <Label> Net derivative instrument fair value changes during the period, net of tax of $(4,704) for the year ended Dec. 31, 2007; ($5,758) for the year ended Dec. 31, 2008; and $4,224 for the year ended Dec. 31, 2009 </Label> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
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| | | <Id> 13 </Id> |
| | | <Label> Unrealized gain (loss) - marketable securities, net of tax of $2 for the year ended Dec. 31, 2007; $(513) for the year ended Dec. 31, 2008; and $284 for the year ended Dec. 31, 2009 </Label> |
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| | | <ElementDefenition> No definition available. </ElementDefenition> |
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| | | <Label> Comprehensive income for the period </Label> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ElementDefenition> No definition available. </ElementDefenition> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <ShortDefinition> No definition available. </ShortDefinition> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
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| <NonNumericTextHeader/> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
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| <NonNumericTextHeader/> |
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| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
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| <hasSegments> true </hasSegments> |
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| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
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| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 16 </Id> |
| | | <Label> Cumulative preferred stock </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_PreferredStockDividends </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
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| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 5 </Id> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 17 </Id> |
| | | <Label> Common stock </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_DividendsCommonStock </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 5 </Id> |
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| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 18 </Id> |
| | | <Label> Issuances of common stock </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_StockIssuedDuringPeriodValueNewIssues </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 62523000 </NumericAmount> |
| <RoundedNumericAmount> 62523 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 372061000 </NumericAmount> |
| <RoundedNumericAmount> 372061 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 19 </Id> |
| | | <Label> Issuances of common stock - shares </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_StockIssuedDuringPeriodSharesNewIssues </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> shares </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 25009000 </NumericAmount> |
| <RoundedNumericAmount> 25009 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <NonNumericTextHeader/> |
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| <Cell> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
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| <Cell> |
| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 20 </Id> |
| | | <Label> Share-based compensation </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasSegments> false </hasSegments> |
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| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 21 </Id> |
| | | <Label> Balance at Dec. 31, 2008 </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> xel_CommonShareholdersEquity </ElementName> |
| | | <ElementPrefix> xel </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock... </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> true </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> true </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 1134480000 </NumericAmount> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 2 </Id> |
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| <IsNumeric> true </IsNumeric> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <IsNumeric> true </IsNumeric> |
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| <NonNumericTextHeader/> |
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| </Cells> |
| | | <ElementDefenition> Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock at Par, Common Stock Additional Paid-in Capital, Retained Earnings, and Accumulated Other Comprehensive Income (Loss). </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 22 </Id> |
| | | <Label> Shares, balance at Dec. 31, 2008 </Label> |
| | | <Level> 4 </Level> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <Label> Changes in unrecognized amounts of pension and retiree medical benefits, net of tax of $(1,872) for the year ended Dec. 31, 2007; $(11,986) for the year ended Dec. 31, 2008; and $(2,203) for the year ended Dec. 31, 2009 </Label> |
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| | | <Label> Net derivative instrument fair value changes during the period, net of tax of $(4,704) for the year ended Dec. 31, 2007; ($5,758) for the year ended Dec. 31, 2008; and $4,224 for the year ended Dec. 31, 2009 </Label> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| | | <Label> Unrealized gain (loss) - marketable securities, net of tax of $2 for the year ended Dec. 31, 2007; $(513) for the year ended Dec. 31, 2008; and $284 for the year ended Dec. 31, 2009 </Label> |
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| | | <ElementPrefix> us-gaap </ElementPrefix> |
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| <NonNumericTextHeader/> |
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| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> true </IsTotalLabel> |
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| | <Row> |
| | | <Id> 15 </Id> |
| | | <Label> Dividends declared: </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_DividendsAbstract </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> string </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> true </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
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| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <hasScenarios> false </hasScenarios> |
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| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 16 </Id> |
| | | <Label> Cumulative preferred stock </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_PreferredStockDividends </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
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| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
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| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <Id> 3 </Id> |
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| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 17 </Id> |
| | | <Label> Common stock </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_DividendsCommonStock </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> debit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
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| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <hasSegments> false </hasSegments> |
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| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 18 </Id> |
| | | <Label> Issuances of common stock </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_StockIssuedDuringPeriodValueNewIssues </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
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| <hasSegments> true </hasSegments> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 19 </Id> |
| | | <Label> Issuances of common stock - shares </Label> |
| | | <Level> 5 </Level> |
| | | <ElementName> us-gaap_StockIssuedDuringPeriodSharesNewIssues </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> shares </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> false </IsCalendarTitle> |
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| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 3717000 </NumericAmount> |
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| <NonNumbericText/> |
| <NonNumericTextHeader/> |
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| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <Cell> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
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| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
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| <hasScenarios> false </hasScenarios> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 20 </Id> |
| | | <Label> Share-based compensation </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> duration </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
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| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> false </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <NonNumericTextHeader/> |
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| <hasScenarios> false </hasScenarios> |
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| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
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| <hasSegments> false </hasSegments> |
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| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
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| | <Row> |
| | | <Id> 21 </Id> |
| | | <Label> Balance at Dec. 31, 2009 </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> xel_CommonShareholdersEquity </ElementName> |
| | | <ElementPrefix> xel </ElementPrefix> |
| | | <IsBaseElement> false </IsBaseElement> |
| | | <BalanceType> credit </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ElementDataType> monetary </ElementDataType> |
| | | <ShortDefinition> Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock... </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> true </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
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| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> true </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> true </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 1143773000 </NumericAmount> |
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| <NonNumbericText/> |
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| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
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| <ShowCurrencySymbol> true </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 4769980000 </NumericAmount> |
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| <NonNumbericText/> |
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| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <ShowCurrencySymbol> true </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 1419201000 </NumericAmount> |
| <RoundedNumericAmount> 1419201 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> true </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> -49709000 </NumericAmount> |
| <RoundedNumericAmount> -49709 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 5 </Id> |
| <ShowCurrencySymbol> true </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 7283245000 </NumericAmount> |
| <RoundedNumericAmount> 7283245 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> Total of all Stockholders' Equity items other than those pertaining to Preferred Stock. Includes the following: Common Stock at Par, Common Stock Additional Paid-in Capital, Retained Earnings, and Accumulated Other Comprehensive Income (Loss). </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | <Row> |
| | | <Id> 22 </Id> |
| | | <Label> Shares, balance at Dec. 31, 2009 </Label> |
| | | <Level> 4 </Level> |
| | | <ElementName> us-gaap_SharesIssued </ElementName> |
| | | <ElementPrefix> us-gaap </ElementPrefix> |
| | | <IsBaseElement> true </IsBaseElement> |
| | | <BalanceType> na </BalanceType> |
| | | <PeriodType> instant </PeriodType> |
| | | <ElementDataType> shares </ElementDataType> |
| | | <ShortDefinition> No definition available. </ShortDefinition> |
| | | <IsReportTitle> false </IsReportTitle> |
| | | <IsSegmentTitle> false </IsSegmentTitle> |
| | | <IsSubReportEnd> false </IsSubReportEnd> |
| | | <IsCalendarTitle> true </IsCalendarTitle> |
| | | <IsTuple> false </IsTuple> |
| | | <IsAbstractGroupTitle> false </IsAbstractGroupTitle> |
| | | <IsBeginningBalance> false </IsBeginningBalance> |
| | | <IsEndingBalance> true </IsEndingBalance> |
| | | <IsEPS> false </IsEPS> |
| | | <Cells> |
| <Cell> |
| <Id> 1 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 457509000 </NumericAmount> |
| <RoundedNumericAmount> 457509 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 2 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 3 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 4 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> false </IsNumeric> |
| <NumericAmount> 0 </NumericAmount> |
| <RoundedNumericAmount> 0 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> true </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| <Cell> |
| <Id> 5 </Id> |
| <ShowCurrencySymbol> false </ShowCurrencySymbol> |
| <IsNumeric> true </IsNumeric> |
| <NumericAmount> 457509263 </NumericAmount> |
| <RoundedNumericAmount> 457509 </RoundedNumericAmount> |
| <NonNumbericText/> |
| <NonNumericTextHeader/> |
| <FootnoteIndexer/> |
| <hasSegments> false </hasSegments> |
| <hasScenarios> false </hasScenarios> |
| </Cell> |
| </Cells> |
| | | <ElementDefenition> No definition available. </ElementDefenition> |
| | | <ElementReferences> No authoritative reference available. </ElementReferences> |
| | | <IsTotalLabel> false </IsTotalLabel> |
| | | </Row> |
| | </Rows> |
| <Footnotes/> |
| <ComparabilityReport> false </ComparabilityReport> |
| <NumberOfCols> 5 </NumberOfCols> |
| <NumberOfRows> 46 </NumberOfRows> |
| <HasScenarios> false </HasScenarios> |
| <MonetaryRoundingLevel> Thousands </MonetaryRoundingLevel> |
| <SharesRoundingLevel> Thousands </SharesRoundingLevel> |
| <PerShareRoundingLevel> UnKnown </PerShareRoundingLevel> |
| <HasPureData> false </HasPureData> |
| <SharesShouldBeRounded> true </SharesShouldBeRounded> |
| </InstanceReport> |