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Fair Value Measurements Nonperformance Risk (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Nonperformance Risk |
Derivative credit valuation adjustment, assets | $ 1 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets
Derivative credit valuation adjustment, liabilities | $ 2 us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities

X
- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
Name: | us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity. + References No definition available. + Details
Name: | us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration