Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative Assets
Derivative Assets	$ 560	$ 567
Collateral adjustment	(18)	(12)
Derivative assets, current	73	116
Derivative assets, noncurrent	37	40
Derivative Liabilities
Derivative Liabilities	(652)	(533)
Collateral adjustment	12	6
Derivative liabilities, current	(89)	(68)
Derivative liabilities, noncurrent	(119)	(60)
Current derivative assets
Derivative Assets
Derivative Assets	371	446
Counterparty netting	(280)	(318)
Collateral adjustment	(18)	(12)
Derivative assets, current	73	116
Noncurrent derivative assets
Derivative Assets
Derivative Assets	189	121
Counterparty netting	(152)	(81)
Collateral adjustment	0	0
Derivative assets, noncurrent	37	40
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(369)	(386)
Counterparty netting	280	318
Collateral adjustment	0	0
Derivative liabilities, current	(89)	(68)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(283)	(147)
Counterparty netting	152	81
Collateral adjustment	12	6
Derivative liabilities, noncurrent	$ (119)	$ (60)

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