Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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			(60)	(569)
Reclassification of losses (gains) to net income during period			(49)	535
Total other comprehensive income (loss) for period	$ (63)	$ (380)	(109)	(34)
Accumulated Other Comprehensive Income (Loss), Ending balance	177	(199)	177	(199)
Interest expense	309	316	628	639
Revenue	(16,060)	(9,450)	(29,068)	(18,605)
Operating costs and expenses	14,341	8,067	25,738	15,620
Total	(1,440)	(1,146)	(2,771)	(2,509)
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			14	18
Total other comprehensive income (loss) for period			14	201
Accumulated Other Comprehensive Income (Loss), Ending balance	161	127	161	127
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			(60)	(752)
Reclassification of losses (gains) to net income during period			(63)	517
Total other comprehensive income (loss) for period			(123)	(235)
Accumulated Other Comprehensive Income (Loss), Ending balance	14	(328)	14	(328)
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 out of Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Total	(102)	(89)	(49)	535
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Interest expense	6	10	14	18
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Revenue	(86)	(99)	(47)	498
Operating costs and expenses	$ (22)	$ 0	$ (16)	$ 19