Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2023	May 17, 2023	Sep. 30, 2024
Operating revenues	$ 650	$ 516	$ 817	$ 1,210	$ 1,648
Fuel and energy purchases	(222)	(253)	(310)	(176)	(535)
Nuclear fuel amortization	(30)	(47)	(72)	(33)	(93)
Unrealized gain (loss) on derivative instruments (Note 3)	7	44	(2)	(123)	(5)
Energy Expenses	(245)	(256)	(384)	(332)	(633)
Operating Expenses
Operation, maintenance and development	(127)	(140)	(209)	(285)	(445)
General and administrative	(38)	(37)	(55)	(51)	(121)
Depreciation, amortization and accretion (Note 8)	(75)	(66)	(94)	(200)	(225)
Impairments	0	(2)	(2)	(381)	0
Other operating income (expense), net	(7)	(8)	(11)	(37)	(14)
Operating Income (Loss)	158	7	62	(76)	210
Nuclear decommissioning trust funds gain (loss), net	67	(24)	15	57	169
Interest expense and other finance charges (Note 11)	(66)	(68)	(101)	(163)	(187)
Reorganization income (expense), net	0	0	0	799	0
Gain (loss) on sale of assets, net (Note 17)	0	0	0	50	885
Other non-operating income (expense), net	20	(7)	(18)	10	60
Income (loss) before income taxes	179	(92)	(42)	677	1,137
Income tax benefit (expense)	(11)	16	(3)	(212)	(192)
Net Income (Loss)	168	(76)	(45)	465	945
Less: Net income (loss) attributable to noncontrolling interest	0	1	3	(14)	29
Net Income (Loss) Attributable to Stockholders (Successor) / Member (Predecessor)	$ 168	$ (77)	$ (48)	$ 479	$ 916
Per Common Share (Successor)
Net Income (Loss) Attributable to Stockholders - Basic (in dollars per share)	$ 3.30	$ (1.30)	$ (0.81)		$ 16.44
Net Income (Loss) Attributable to Stockholders - Diluted (in dollars per share)	$ 3.16	$ (1.30)	$ (0.81)		$ 15.86
Weighted-Average Number of Common Shares Outstanding - Basic (in shares)	50,924	59,029	59,029	0	55,703
Weighted-Average Number of Common Shares Outstanding - Diluted (in shares)	53,169	59,029	59,029	0	57,756
Capacity revenues
Operating revenues	$ 50	$ 44	$ 70	$ 108	$ 141
Energy and other revenues
Operating revenues	505	600	788	1,042	1,444
Unrealized gain (loss) on derivative instruments (Note 3)
Operating revenues	$ 95	$ (128)	$ (41)	$ 60	$ 63