Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative Assets
Derivative Assets	$ 1,041	$ 567
Collateral adjustment	0	(12)
Derivative assets, current	171	116
Derivative assets, noncurrent	50	40
Derivative Liabilities
Derivative Liabilities	(1,216)	(533)
Collateral adjustment	0	6
Derivative liabilities, current	(232)	(68)
Derivative liabilities, noncurrent	(164)	(60)
Current derivative assets
Derivative Assets
Derivative Assets	794	446
Counterparty netting	(623)	(318)
Collateral adjustment	0	(12)
Derivative assets, current	171	116
Noncurrent derivative assets
Derivative Assets
Derivative Assets	247	121
Counterparty netting	(197)	(81)
Collateral adjustment	0	0
Derivative assets, noncurrent	50	40
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(855)	(386)
Counterparty netting	623	318
Collateral adjustment	0	0
Derivative liabilities, current	(232)	(68)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(361)	(147)
Counterparty netting	197	81
Collateral adjustment	0	6
Derivative liabilities, noncurrent	$ (164)	$ (60)

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