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Derivatives and Risk Management Activities (Details 6) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivative Asset Positions |  |
Gross Position - Asset | $ 246 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 493 us-gaap_DerivativeFairValueOfDerivativeAsset
Netting Adjustment | (52)us-gaap_DerivativeAssetFairValueGrossLiability | (262)us-gaap_DerivativeAssetFairValueGrossLiability
Cash collateral received | (112)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset | (133)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Net Position - Asset | 82 us-gaap_DerivativeAssets | 98 us-gaap_DerivativeAssets
Derivative Liability Positions |  |
Gross Position - Liability | (250)us-gaap_DerivativeFairValueOfDerivativeLiability | (384)us-gaap_DerivativeFairValueOfDerivativeLiability
Netting Adjustment | 52 us-gaap_DerivativeLiabilityFairValueGrossAsset | 262 us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Position - Liability | (198)us-gaap_DerivativeLiabilities | (122)us-gaap_DerivativeLiabilities
Other current assets |  |
Derivative Asset Positions |  |
Net Position - Asset | 64 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember | 71 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember
Other long-term assets, net |  |
Derivative Asset Positions |  |
Net Position - Asset | 18 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember | 27 us-gaap_DerivativeAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember
Other current liabilities |  |
Derivative Liability Positions |  |
Net Position - Liability | (108)us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember | (91)us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Other long-term liabilities and deferred credits |  |
Derivative Liability Positions |  |
Net Position - Liability | $ (90)us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember | $ (31)us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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