Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative Assets
Derivative assets	$ 439	$ 549
Collateral adjustment	(12)	(7)
Derivative assets, current	76	47
Derivative assets, noncurrent	62	34
Derivative Liabilities
Derivative liabilities	(409)	(656)
Collateral adjustment	30	28
Derivative liabilities, current	(42)	(69)
Derivative liabilities, noncurrent	(48)	(98)
Current derivative assets
Derivative Assets
Derivative assets	301	447
Counterparty netting	(225)	(396)
Collateral adjustment	0	(4)
Derivative assets, current	76	47
Noncurrent derivative assets
Derivative Assets
Derivative assets	138	102
Counterparty netting	(64)	(65)
Collateral adjustment	(12)	(3)
Derivative assets, noncurrent	62	34
Current derivative liabilities
Derivative Liabilities
Derivative liabilities	(297)	(493)
Counterparty netting	225	396
Collateral adjustment	30	28
Derivative liabilities, current	(42)	(69)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities	(112)	(163)
Counterparty netting	64	65
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (48)	$ (98)

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

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