Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Assets
Derivative assets	$ 496	$ 549
Collateral adjustment	(3)	(7)
Derivative assets, current	68	47
Derivative assets, noncurrent	73	34
Derivative Liabilities
Derivative liabilities	(491)	(656)
Collateral adjustment	13	28
Derivative liabilities, current	(33)	(69)
Derivative liabilities, noncurrent	(93)	(98)
Current derivative assets
Derivative Assets
Derivative assets	349	447
Counterparty netting	(278)	(396)
Collateral adjustment	(3)	(4)
Derivative assets, current	68	47
Noncurrent derivative assets
Derivative Assets
Derivative assets	147	102
Counterparty netting	(74)	(65)
Collateral adjustment	0	(3)
Derivative assets, noncurrent	73	34
Current derivative liabilities
Derivative Liabilities
Derivative liabilities	(312)	(493)
Counterparty netting	278	396
Collateral adjustment	1	28
Derivative liabilities, current	(33)	(69)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities	(179)	(163)
Counterparty netting	74	65
Collateral adjustment	12	0
Derivative liabilities, noncurrent	$ (93)	$ (98)

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

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