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12/31/2009
USD ($)
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USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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USD ($)
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USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Level 2 [Member]
12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Level 2 [Member]
12/31/2010
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Level 2 [Member]
12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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{us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis} : Level 3 [Member]
12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2008
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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USD ($)
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12/31/2009
USD ($)
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USD ($)
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/><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>true</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios></Cell><Cell><Id>60</Id><IsNumeric>true</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>288000000</NumericAmount><RoundedNumericAmount>288</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>true</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Monetary</Unit><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph d(iv)(b)(i)

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 87
 -Paragraph 49

</ElementReferences><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Fair value of plan assets</Label></Row></Rows><Footnotes /><NumberOfCols>60</NumberOfCols><NumberOfRows>1</NumberOfRows><ReportName>Employee Retirement Plans (Schedule of defined benefit plan of assets) (Details) (USD $)</ReportName><MonetaryRoundingLevel>Millions</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>false</HasCustomUnits><SharesShouldBeRounded>true</SharesShouldBeRounded></InstanceReport>
