Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative Assets
Derivative Assets	$ 340	$ 663
Collateral adjustment	(10)	(17)
Derivative assets, current	72	102
Derivative assets, noncurrent	22	31
Derivative Liabilities
Derivative Liabilities	(338)	(669)
Derivative liabilities, current	(50)	(67)
Derivative liabilities, noncurrent	(52)	(89)
Current derivative assets
Derivative Assets
Derivative Assets	266	563
Counterparty netting	(187)	(451)
Collateral adjustment	(7)	(10)
Derivative assets, current	72	102
Noncurrent derivative assets
Derivative Assets
Derivative Assets	74	100
Counterparty netting	(49)	(62)
Collateral adjustment	(3)	(7)
Derivative assets, noncurrent	22	31
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(237)	(518)
Counterparty netting	187	451
Collateral adjustment	0	0
Derivative liabilities, current	(50)	(67)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(101)	(151)
Counterparty netting	49	62
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (52)	$ (89)

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