Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative Assets
Derivative Assets, gross	$ 550	$ 711
Collateral adjustment	(6)	(2)
Derivative assets, current	53	129
Derivative assets, noncurrent	35	54
Derivative Liabilities
Derivative Liabilities	(629)	(705)
Collateral adjustment	32	36
Derivative liabilities, current	(47)	(57)
Derivative liabilities, noncurrent	(94)	(86)
Current derivative asset
Derivative Assets
Derivative Assets, gross	429	570
Counterparty netting	(372)	(441)
Collateral adjustment	(4)	0
Noncurrent derivative asset
Derivative Assets
Derivative Assets, gross	121	141
Counterparty netting	(84)	(85)
Collateral adjustment	(2)	(2)
Current derivative liability
Derivative Liabilities
Derivative Liabilities	(442)	(521)
Counterparty netting	372	441
Collateral adjustment	23	23
Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(187)	(184)
Counterparty netting	84	85
Collateral adjustment	$ 9	$ 13

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

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