Capital Accounts - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 29,775	$ 28,477	$ 29,589	$ 28,759
Total other comprehensive income (loss) for period	(49)	33	0	(131)
Ending balance	29,919	28,797	29,919	28,797
Interest expense	332	332	672	663
Revenue	(11,363)	(13,483)	(26,780)	(28,243)
Operating costs and expenses	9,592	11,762	23,282	24,736
Total	(1,454)	(1,422)	(2,860)	(2,905)
Cash Flow Hedges | Commodity Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			91	154
Other comprehensive income (loss) for period, before reclassifications			22	(83)
Reclassification of losses (gains) to net income during period			(33)	(47)
Total other comprehensive income (loss) for period			(11)	(130)
Ending balance	80	24	80	24
Cash Flow Hedges | Interest Rate Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			143	151
Other comprehensive income (loss) for period, before reclassifications			14	2
Reclassification of losses (gains) to net income during period			(3)	(3)
Total other comprehensive income (loss) for period			11	(1)
Ending balance	154	150	154	150
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
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
Ending balance	2	2	2	2
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			236	307
Other comprehensive income (loss) for period, before reclassifications			36	(81)
Reclassification of losses (gains) to net income during period			(36)	(50)
Total other comprehensive income (loss) for period			0	(131)
Ending balance	236	176	236	176
Reclassification out of Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total	(61)	(46)	(36)	(50)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Commodity Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Revenue	(67)	(61)	(53)	(80)
Operating costs and expenses	8	16	20	33
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Interest Rate Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Interest expense	$ (2)	$ (1)	$ (3)	$ (3)