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