Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative Assets
Derivative Assets	$ 580	$ 775
Collateral adjustment	(26)	0
Derivative assets, current	65	133
Derivative assets, noncurrent	29	41
Derivative Liabilities
Derivative Liabilities	(564)	(770)
Derivative liabilities, current	(60)	(83)
Derivative liabilities, noncurrent	(44)	(86)
Current derivative assets
Derivative Assets
Derivative Assets	444	646
Counterparty netting	(361)	(513)
Collateral adjustment	(18)	0
Derivative assets, current	65	133
Noncurrent derivative assets
Derivative Assets
Derivative Assets	136	129
Counterparty netting	(99)	(88)
Collateral adjustment	(8)	0
Derivative assets, noncurrent	29	41
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(421)	(596)
Counterparty netting	361	513
Collateral adjustment	0	0
Derivative liabilities, current	(60)	(83)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(143)	(174)
Counterparty netting	99	88
Collateral adjustment	0	0
Derivative liabilities, noncurrent	$ (44)	$ (86)

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