Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Assets
Derivative Assets	$ 565	$ 663
Collateral adjustment	0	(17)
Derivative assets, current	113	102
Derivative assets, noncurrent	46	31
Derivative Liabilities
Derivative Liabilities	(572)	(669)
Collateral adjustment	4	0
Derivative liabilities, current	(94)	(67)
Derivative liabilities, noncurrent	(68)	(89)
Current derivative assets
Derivative Assets
Derivative Assets	449	563
Counterparty netting	(336)	(451)
Collateral adjustment	0	(10)
Derivative assets, current	113	102
Noncurrent derivative assets
Derivative Assets
Derivative Assets	116	100
Counterparty netting	(70)	(62)
Collateral adjustment	0	(7)
Derivative assets, noncurrent	46	31
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(434)	(518)
Counterparty netting	336	451
Collateral adjustment	4	0
Derivative liabilities, current	(94)	(67)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(138)	(151)
Counterparty netting	70	62
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (68)	$ (89)

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