Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating revenues	$ 17,224	$ 14,779	$ 13,728
Fuel, purchased power costs, and delivery fees	(7,285)	(7,557)	(10,401)
Operating costs	(2,414)	(1,702)	(1,645)
Selling, general, and administrative expenses	(1,601)	(1,308)	(1,189)
Interest expenses and related charges	(900)	(740)	(368)
Depreciation and amortization	(1,843)	(1,502)	(1,596)
Income tax expense (benefit)	(655)	(508)	350
Other	286	30	(89)
Net income (loss)	2,812	1,492	(1,210)
Capital expenditures, including nuclear fuel and excluding growth expenditures	1,917	1,537	1,108
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	24,730	21,355	18,482
Fuel, purchased power costs, and delivery fees	(14,794)	(14,135)	(15,156)
Operating costs	(2,411)	(1,700)	(1,644)
Selling, general, and administrative expenses	(1,362)	(1,183)	(1,123)
Interest expenses and related charges	(2)	2	3
Depreciation and amortization	(1,777)	(1,434)	(1,527)
Income tax expense (benefit)	0	(1)	0
Other	222	115	25
Net income (loss)	4,606	3,019	(940)
Capital expenditures, including nuclear fuel and excluding growth expenditures	1,859	1,479	1,053
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenues	(7,506)	(6,576)	(4,754)
Fuel, purchased power costs, and delivery fees	7,509	6,578	4,755
Operating costs	(3)	(2)	(1)
Selling, general, and administrative expenses	(239)	(125)	(66)
Interest expenses and related charges	(898)	(742)	(371)
Depreciation and amortization	(66)	(68)	(69)
Income tax expense (benefit)	(655)	(507)	350
Other	64	(85)	(114)
Net income (loss)	(1,794)	(1,527)	(270)
Capital expenditures, including nuclear fuel and excluding growth expenditures	58	58	55
Retail | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	12,797	10,572	9,455
Fuel, purchased power costs, and delivery fees	(10,276)	(9,046)	(7,169)
Operating costs	(159)	(123)	(143)
Selling, general, and administrative expenses	(977)	(858)	(826)
Interest expenses and related charges	(54)	(20)	(14)
Depreciation and amortization	(114)	(102)	(145)
Income tax expense (benefit)	0	0	0
Other	(1)	1	0
Net income (loss)	1,216	424	1,158
Capital expenditures, including nuclear fuel and excluding growth expenditures	4	1	1
Texas | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	5,394	3,979	3,878
Fuel, purchased power costs, and delivery fees	(1,596)	(2,028)	(3,052)
Operating costs	(996)	(917)	(832)
Selling, general, and administrative expenses	(169)	(140)	(135)
Interest expenses and related charges	46	21	20
Depreciation and amortization	(581)	(550)	(541)
Income tax expense (benefit)	0	0	0
Other	35	33	76
Net income (loss)	2,133	398	(586)
Capital expenditures, including nuclear fuel and excluding growth expenditures	1,124	750	520
East | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	5,661	5,890	4,429
Fuel, purchased power costs, and delivery fees	(2,698)	(2,730)	(4,132)
Operating costs	(1,103)	(528)	(482)
Selling, general, and administrative expenses	(148)	(127)	(97)
Interest expenses and related charges	9	(2)	(6)
Depreciation and amortization	(996)	(703)	(768)
Income tax expense (benefit)	0	(1)	0
Other	177	(50)	(71)
Net income (loss)	902	1,749	(1,127)
Capital expenditures, including nuclear fuel and excluding growth expenditures	661	362	187
West | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	877	914	336
Fuel, purchased power costs, and delivery fees	(221)	(328)	(481)
Operating costs	(72)	(58)	(42)
Selling, general, and administrative expenses	(25)	(24)	(21)
Interest expenses and related charges	1	8	6
Depreciation and amortization	(86)	(79)	(42)
Income tax expense (benefit)	0	0	0
Other	(3)	21	6
Net income (loss)	471	454	(238)
Capital expenditures, including nuclear fuel and excluding growth expenditures	70	366	345
Asset Closure | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1	0	384
Fuel, purchased power costs, and delivery fees	(3)	(3)	(322)
Operating costs	(81)	(74)	(145)
Selling, general, and administrative expenses	(43)	(34)	(44)
Interest expenses and related charges	(4)	(5)	(3)
Depreciation and amortization	0	0	(31)
Income tax expense (benefit)	0	0	0
Other	14	110	14
Net income (loss)	(116)	(6)	(147)
Capital expenditures, including nuclear fuel and excluding growth expenditures	$ 0	$ 0	$ 0