Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
	May 17, 2023	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022
Operating revenues	$ 1,210	$ 1,344	$ 2,115	$ 3,089
Fuel and energy purchases	(176)	(424)	(694)	(938)
Nuclear fuel amortization	(33)	(108)	(123)	(94)
Unrealized gain (loss) on derivative instruments (Note 5)	(123)	(3)	20	(52)
Energy Expenses	(332)	(535)	(797)	(1,084)
Operating Expenses
Operation, maintenance and development	(285)	(358)	(592)	(610)
General and administrative	(51)	(93)	(163)	(106)
Depreciation, amortization and accretion	(200)	(165)	(298)	(520)
Impairments (Note 10)	(381)	(3)	(1)	0
Operational restructuring	0	0	0	(488)
Other operating income (expense), net	(37)	(30)	(38)	(40)
Operating Income (Loss)	(76)	160	226	241
Nuclear decommissioning trust funds gain (loss), net (Note 9)	57	108	178	(184)
Interest expense and other finance charges (Note 13)	(163)	(176)	(238)	(359)
Reorganization income (expense), net (Note 4)	799	0	0	(812)
Consolidation of subsidiary gain (loss) (Note 2)	0	0	0	(170)
Gain (loss) on sale of assets, net (Note 20)	50	7	884	0
Other non-operating income (expense), net	10	95	61	(44)
Income (loss) before income taxes	677	194	1,111	(1,328)
Income tax benefit (expense)	(212)	(51)	(98)	35
Net Income (Loss)	465	143	1,013	(1,293)
Less: Net income (loss) attributable to noncontrolling interest	(14)	9	15	(4)
Net Income (Loss) Attributable to Stockholders (Successor) / Member (Predecessor)	$ 479	$ 134	$ 998	$ (1,289)
Per Common Share (Successor)
Net Income (Loss) Attributable to Stockholders - Basic (in dollars per share)		$ 2.27	$ 18.40
Net Income (Loss) Attributable to Stockholders - Diluted (in dollars per share)		$ 2.26	$ 17.67
Weighted-Average Number of Common Shares Outstanding - Basic (in shares)	0	59,029	54,254	0
Weighted-Average Number of Common Shares Outstanding - Diluted (in shares)	0	59,399	56,486	0
Capacity revenues
Operating revenues	$ 108	$ 133	$ 192	$ 377
Energy and other revenues
Operating revenues	1,042	1,156	1,881	2,035
Unrealized gain (loss) on derivative instruments (Note 5)
Operating revenues	$ 60	$ 55	$ 42	$ 677