Capital Accounts - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 29,919	$ 28,797	$ 29,589	$ 28,759
Total other comprehensive income (loss) for period	28	127	28	(4)
Ending balance	30,050	29,158	30,050	29,158
Interest expense	354	343	1,026	1,006
Revenue	(12,023)	(13,775)	(38,803)	(42,018)
Operating costs and expenses	10,366	12,033	33,648	36,769
Total	(1,356)	(1,432)	(4,216)	(4,337)
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			87	127
Reclassification of losses (gains) to net income during period			(68)	(124)
Total other comprehensive income (loss) for period			19	3
Ending balance	110	157	110	157
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			(5)	(5)
Total other comprehensive income (loss) for period			9	(7)
Ending balance	152	144	152	144
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			101	125
Reclassification of losses (gains) to net income during period			(73)	(129)
Total other comprehensive income (loss) for period			28	(4)
Ending balance	264	303	264	303
Reclassification out of Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Total	(37)	(79)	(73)	(129)
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	(47)	(96)	(100)	(176)
Operating costs and expenses	12	19	32	52
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)	$ (2)	$ (5)	$ (5)