Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivative Assets:
Total fair value of derivatives	$ 1,178,000,000	$ 833,000,000
Collateral adjustment	0	(26,000,000)
Derivative Asset, Current	128,000,000us-gaap_DerivativeAssetsCurrent	99,000,000us-gaap_DerivativeAssetsCurrent
Derivative Assets, Noncurrent	44,000,000us-gaap_DerivativeAssetsNoncurrent	27,000,000us-gaap_DerivativeAssetsNoncurrent
Derivative Liabilities:
Total fair value of derivatives	(1,110,000,000)	(936,000,000)
Counterparty netting	19,000,000	17,000,000
Derivative Liabilities, Current	(77,000,000)us-gaap_DerivativeLiabilitiesCurrent	(195,000,000)us-gaap_DerivativeLiabilitiesCurrent
Derivative Liabilities, Noncurrent	(8,000,000)us-gaap_DerivativeLiabilitiesNoncurrent	(43,000,000)us-gaap_DerivativeLiabilitiesNoncurrent
Current Derivative Asset [Member]
Derivative Assets:
Total fair value of derivatives	1,083,000,000	691,000,000
Counterparty netting	(955,000,000)	(566,000,000)
Collateral adjustment	0	(26,000,000)
Noncurrent Derivative Asset [Member]
Derivative Assets:
Total fair value of derivatives	95,000,000	142,000,000
Counterparty netting	(51,000,000)	(115,000,000)
Collateral adjustment	0	0
Current Derivative Liability [Member]
Derivative Liabilities:
Total fair value of derivatives	(1,041,000,000)	(773,000,000)
Counterparty netting	9,000,000	12,000,000
Collateral adjustment	955,000,000	566,000,000
Noncurrent Derivative Liability [Member]
Derivative Liabilities:
Total fair value of derivatives	(69,000,000)	(163,000,000)
Counterparty netting	10,000,000	5,000,000
Collateral adjustment	$ 51,000,000	$ 115,000,000

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

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