Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Assets
Derivative Assets	$ 2,340	$ 567
Collateral adjustment	(122)	(12)
Derivative assets, current	347	116
Derivative assets, noncurrent	81	40
Derivative Liabilities
Derivative Liabilities	(2,557)	(533)
Collateral adjustment	58	6
Derivative liabilities, current	(465)	(68)
Derivative liabilities, noncurrent	(244)	(60)
Current derivative assets
Derivative Assets
Derivative Assets	1,938	446
Counterparty netting	(1,498)	(318)
Collateral adjustment	(93)	(12)
Derivative assets, current	347	116
Noncurrent derivative assets
Derivative Assets
Derivative Assets	402	121
Counterparty netting	(292)	(81)
Collateral adjustment	(29)	0
Derivative assets, noncurrent	81	40
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(2,011)	(386)
Counterparty netting	1,498	318
Collateral adjustment	48	0
Derivative liabilities, current	(465)	(68)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(546)	(147)
Counterparty netting	292	81
Collateral adjustment	10	6
Derivative liabilities, noncurrent	$ (244)	$ (60)

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