Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			$ 286	$ (165)
Other comprehensive income (loss) for period, before reclassifications			126	(669)
Reclassification of losses (gains) to net income during period			(39)	662
Total other comprehensive income (loss) for period	$ 196	$ 27	87	(7)
Accumulated Other Comprehensive Income (Loss), Ending balance	373	(172)	373	(172)
Interest expense	309	316	937	955
Revenue	(15,468)	(10,832)	(44,536)	(29,437)
Operating costs and expenses	13,812	9,409	39,550	25,029
Total	(1,392)	(1,182)	(4,163)	(3,691)
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			0	183
Reclassification of losses (gains) to net income during period			15	28
Total other comprehensive income (loss) for period			15	211
Accumulated Other Comprehensive Income (Loss), Ending balance	162	137	162	137
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			126	(852)
Reclassification of losses (gains) to net income during period			(54)	634
Total other comprehensive income (loss) for period			72	(218)
Accumulated Other Comprehensive Income (Loss), Ending balance	209	(311)	209	(311)
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	2
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	10	127	(39)	662
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	1	10	15	28
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	35	117	(12)	615
Operating costs and expenses	$ (26)	$ 0	$ (42)	$ 19