Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative Assets
Derivative Assets	$ 775	$ 663
Collateral adjustment	0	(17)
Derivative asset, current	133	102
Derivative assets, noncurrent	41	31
Derivative Liabilities
Derivative Liabilities	(770)	(669)
Derivative liabilities, current	(83)	(67)
Derivative liabilities, noncurrent	(86)	(89)
Current derivative asset
Derivative Assets
Derivative Assets	646	563
Counterparty netting	(513)	(451)
Collateral adjustment	0	(10)
Derivative asset, current	133	102
Noncurrent derivative asset
Derivative Assets
Derivative Assets	129	100
Counterparty netting	(88)	(62)
Collateral adjustment	0	(7)
Derivative assets, noncurrent	41	31
Current derivative liability
Derivative Liabilities
Derivative Liabilities	(596)	(518)
Counterparty netting	513	451
Collateral adjustment	0	0
Derivative liabilities, current	(83)	(67)
Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(174)	(151)
Counterparty netting	88	62
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (86)	$ (89)

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