Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative Assets
Derivative assets	$ 503	$ 549
Collateral adjustment	(1)	(7)
Derivative assets, current	81	47
Derivative assets, noncurrent	58	34
Derivative Liabilities
Derivative liabilities	(489)	(656)
Collateral adjustment	24	28
Derivative liabilities, current	(39)	(69)
Derivative liabilities, noncurrent	(63)	(98)
Current derivative assets
Derivative Assets
Derivative assets	355	447
Counterparty netting	(273)	(396)
Collateral adjustment	(1)	(4)
Derivative assets, current	81	47
Noncurrent derivative assets
Derivative Assets
Derivative assets	148	102
Counterparty netting	(90)	(65)
Collateral adjustment	0	(3)
Derivative assets, noncurrent	58	34
Current derivative liabilities
Derivative Liabilities
Derivative liabilities	(334)	(493)
Counterparty netting	273	396
Collateral adjustment	22	28
Derivative liabilities, current	(39)	(69)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities	(155)	(163)
Counterparty netting	90	65
Collateral adjustment	2	0
Derivative liabilities, noncurrent	$ (63)	$ (98)

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

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