Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ 286	$ (165)
Other comprehensive income (loss) for period, before reclassifications	280	(495)
Reclassification of losses (gains) to net income during period	(201)	946
Total other comprehensive income (loss) for period	79	451	$ (237)
Accumulated Other Comprehensive Income (Loss), Ending balance	365	286	(165)
Interest expense	1,244	1,283	1,287
Revenue	(58,186)	(40,807)	(27,200)
Operating costs and expenses	51,502	35,078	22,371
Total	(5,615)	(4,755)	(3,886)
Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	137	(93)
Other comprehensive income (loss) for period, before reclassifications	254	(678)
Reclassification of losses (gains) to net income during period	(220)	908
Total other comprehensive income (loss) for period	34	230
Accumulated Other Comprehensive Income (Loss), Ending balance	171	137	(93)
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	147	(74)
Other comprehensive income (loss) for period, before reclassifications	26	183
Reclassification of losses (gains) to net income during period	19	38
Total other comprehensive income (loss) for period	45	221
Accumulated Other Comprehensive Income (Loss), Ending balance	192	147	(74)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	2	2
Other comprehensive income (loss) for period, before reclassifications	0	0
Reclassification of losses (gains) to net income during period	0	0
Total other comprehensive income (loss) for period	0	0
Accumulated Other Comprehensive Income (Loss), Ending balance	2	2	$ 2
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	(201)	946
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue	(181)	893
Operating costs and expenses	(39)	15
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense	$ 19	$ 38