Capital Accounts - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 30,347	$ 29,775	$ 30,570	$ 29,589
Total other comprehensive income (loss)	189	(49)	(162)	0
Ending balance	31,064	29,919	31,064	29,919
Interest expense	384	332	769	672
Revenue	(18,269)	(11,363)	(32,655)	(26,780)
Operating costs and expenses	16,065	9,592	28,568	23,282
Total	(1,856)	(1,454)	(3,352)	(2,860)
Reclassification out of Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total	182	(61)	139	(36)
Cash Flow Hedges | Commodity Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			184	91
Other comprehensive income (loss) for period, before reclassifications			(301)	22
Reclassification of losses (gains) to net income during period			143	(33)
Total other comprehensive income (loss)			(158)	(11)
Ending balance	26	80	26	80
Cash Flow Hedges | Commodity Derivative Instruments | Reclassification out of Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Revenue	173	(67)	122	(53)
Operating costs and expenses	11	8	21	20
Cash Flow Hedges | Interest Rate Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			150	143
Other comprehensive income (loss) for period, before reclassifications			0	14
Reclassification of losses (gains) to net income during period			(4)	(3)
Total other comprehensive income (loss)			(4)	11
Ending balance	146	154	146	154
Cash Flow Hedges | Interest Rate Derivative Instruments | Reclassification out of Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Interest expense	(2)	(2)	(4)	(3)
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)			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			336	236
Other comprehensive income (loss) for period, before reclassifications			(301)	36
Reclassification of losses (gains) to net income during period			139	(36)
Total other comprehensive income (loss)			(162)	0
Ending balance	$ 174	$ 236	$ 174	$ 236