Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2024

Equity [Abstract]

Schedule of Share Repurchase Program

Summary of activity under the SRP and direct repurchases:

	Successor
	Year Ended December 31, 2024
	Number of Shares (a) (b)	Share Price (c)		Total Amount
Share repurchases	13,227,222	$	149.50	$	1,977
Share retirements	(13,227,222)	149.50		(1,977)

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(a)Includes 7,307,300 shares repurchased from affiliates of Rubric in July 2024 and December 2024 at a weighted average price of $177.16 per share. Of the total shares repurchased by the Company, $850 million purchased from affiliates of Rubric were not under the SRP.

(b)Includes 5,275,862 shares repurchased as result of a tender offer in June 2024 at a weighted average price of $117.16 per share.

(c)Weighted average price per share, including transaction costs and excise taxes.

Schedule of Accumulated Other Comprehensive Income

Changes in AOCI for the periods were:

	Successor				Predecessor
	Year Ended December 31, 2024		May 18 through December 31, 2023		January 1 through May 17, 2023		Year Ended December 31, 2022
Beginning balance	$	(23)	$	—	$	(167)	$	(152)
Gains (losses) arising during the period (a)	12		(36)		6		(84)
Reclassifications to Consolidated Statements of Operations (b)	—		7		5		59
Income tax benefit (expense)	(1)		6		(5)		10
Other comprehensive income (loss)	11		(23)		6		(15)
Cancellation of equity at Emergence	—		—		161		—
Accumulated other comprehensive income (loss)	$	(12)	$	(23)	$	—	$	(167)

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(a)Primarily related to “Postretirement benefit actuarial (gain) loss, net” for the period from May 18 through December 31, 2023 (Successor) and “Available-for-sale securities unrealized gain (loss), net” and “Postretirement benefit actuarial (gain) loss, net” for the year ended December 31, 2022 (Predecessor).

(b)Primarily related to “Available-for-sale securities unrealized gain (loss), net” and “Postretirement benefit actuarial (gain) loss, net” for the year ended December 31, 2022 (Predecessor).

The components of AOCI, net of tax, were:

	Successor
	December 31, 2024		December 31, 2023
Available-for-sale securities unrealized gain (loss), net	$	(3)	$	5
Postretirement benefit prior service credits (costs), net	14		—
Postretirement benefit actuarial gain (loss), net	(23)		(28)
Accumulated other comprehensive income (loss)	$	(12)	$	(23)

The locations of pre-tax gains (losses) reclassified from AOCI and included on the Consolidated Statements of Operations for the periods were:

	Successor				Predecessor
	Year Ended December 31, 2024		May 18 through December 31, 2023		January 1 through May 17, 2023		Year Ended December 31, 2022
Nuclear decommissioning trust funds gain (loss), net (a)	$	(1)	$	(7)	$	(4)	$	(33)
Depreciation, amortization and accretion (b)	—		—		1		2
Operation, maintenance and development (c)	1		—		—		(1)
Other non-operating income (expense), net (d)	—		—		(2)		(27)
Total	$	—	$	(7)	$	(5)	$	(59)

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(a)Available-for-sale securities unrealized gain (loss), net.

(b)Qualifying derivatives unrealized gain (loss).

(c)Postretirement benefit prior service credits (costs), net.

(d)Postretirement benefit actuarial gain (loss), net.