Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative Assets
Derivative Assets	$ 429	$ 663
Collateral adjustment	0	(17)
Derivative assets, current	75	102
Derivative assets, noncurrent	36	31
Derivative Liabilities
Derivative Liabilities	(460)	(669)
Derivative liabilities, current	(68)	(67)
Derivative liabilities, noncurrent	(74)	(89)
Current derivative assets
Derivative Assets
Derivative Assets	346	563
Counterparty netting	(271)	(451)
Collateral adjustment	0	(10)
Derivative assets, current	75	102
Noncurrent derivative assets
Derivative Assets
Derivative Assets	83	100
Counterparty netting	(47)	(62)
Collateral adjustment	0	(7)
Derivative assets, noncurrent	36	31
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(339)	(518)
Counterparty netting	271	451
Collateral adjustment	0	0
Derivative liabilities, current	(68)	(67)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(121)	(151)
Counterparty netting	47	62
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (74)	$ (89)

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