Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets
Derivative Assets, gross	$ 685	$ 711
Collateral adjustment	(7)	(2)
Derivative assets, current	109	129
Derivative assets, noncurrent	53	54
Derivative Liabilities
Derivative Liabilities	(763)	(705)
Collateral adjustment	84	36
Derivative liabilities, current	(67)	(57)
Derivative liabilities, noncurrent	(96)	(86)
Current derivative asset
Derivative Assets
Derivative Assets, gross	527	570
Counterparty netting	(415)	(441)
Collateral adjustment	(3)	0
Noncurrent derivative asset
Derivative Assets
Derivative Assets, gross	158	141
Counterparty netting	(101)	(85)
Collateral adjustment	(4)	(2)
Current derivative liability
Derivative Liabilities
Derivative Liabilities	(545)	(521)
Counterparty netting	415	441
Collateral adjustment	63	23
Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(218)	(184)
Counterparty netting	101	85
Collateral adjustment	$ 21	$ 13

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

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