Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative Assets
Derivative assets	$ 397	$ 652
Collateral adjustment	(7)	(9)
Derivative assets, current	84	103
Derivative assets, noncurrent	58	51
Derivative Liabilities
Derivative liabilities	(397)	(657)
Collateral adjustment	22	22
Derivative liabilities, current	(69)	(99)
Derivative liabilities, noncurrent	(58)	(47)
Current derivative assets
Derivative Assets
Derivative assets	294	540
Counterparty netting	(205)	(437)
Collateral adjustment	(5)	0
Derivative assets, current	84	103
Noncurrent derivative assets
Derivative Assets
Derivative assets	103	112
Counterparty netting	(43)	(52)
Collateral adjustment	(2)	(9)
Derivative assets, noncurrent	58	51
Current derivative liabilities
Derivative Liabilities
Derivative liabilities	(289)	(558)
Counterparty netting	205	437
Collateral adjustment	15	22
Derivative liabilities, current	(69)	(99)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities	(108)	(99)
Counterparty netting	43	52
Collateral adjustment	7	0
Derivative liabilities, noncurrent	$ (58)	$ (47)

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

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