Financial and Other Derivative Instruments Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivative Assets
Derivative asset, gross	$ 764,000,000	$ 1,178,000,000
Collateral adjustment	(1,000,000)	0
Derivative assets, current	74,000,000us-gaap_DerivativeAssetsCurrent	128,000,000us-gaap_DerivativeAssetsCurrent
Derivative assets, noncurrent	40,000,000us-gaap_DerivativeAssetsNoncurrent	44,000,000us-gaap_DerivativeAssetsNoncurrent
Derivative Liabilities
Derivative liability, gross	(770,000,000)	(1,110,000,000)
Collateral adjustment	46,000,000	19,000,000
Derivative liabilities, current	(52,000,000)us-gaap_DerivativeLiabilitiesCurrent	(77,000,000)us-gaap_DerivativeLiabilitiesCurrent
Derivative liabilities, noncurrent	(23,000,000)us-gaap_DerivativeLiabilitiesNoncurrent	(8,000,000)us-gaap_DerivativeLiabilitiesNoncurrent
Current derivative asset
Derivative Assets
Derivative asset, gross	676,000,000	1,083,000,000
Counterparty netting	(601,000,000)	(955,000,000)
Collateral adjustment	(1,000,000)	0
Noncurrent derivative asset
Derivative Assets
Derivative asset, gross	88,000,000	95,000,000
Counterparty netting	(48,000,000)	(51,000,000)
Collateral adjustment	0	0
Current derivative liability
Derivative Liabilities
Derivative liability, gross	(680,000,000)	(1,041,000,000)
Counterparty netting	601,000,000	955,000,000
Collateral adjustment	27,000,000	9,000,000
Noncurrent derivative liability
Derivative Liabilities
Derivative liability, gross	(90,000,000)	(69,000,000)
Counterparty netting	48,000,000	51,000,000
Collateral adjustment	$ 19,000,000	$ 10,000,000

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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