Nuclear Decommissioning Trust Funds (Tables)

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds

	Successor
	September 30, 2024								December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Cash equivalents	$	8	$	—	$	—	$	8	$	9	$	—	$	—	$	9
Equity securities	504		672		44		1,132		491		575		53		1,013
Debt securities	581		12		—		593		570		10		1		579
Receivables (payables), net	4		—		—		4		(26)		—		—		(26)
NDT funds	$	1,097	$	684	$	44	$	1,737	$	1,044	$	585	$	54	$	1,575

Summary of Maturities for Available-for-sale Debt Securities

The contractual maturities for available-for-sale debt securities presented on the Consolidated Balance Sheets were:

	Successor
	September 30, 2024		December 31, 2023
Maturities within one year	$	63	$	105
Maturities within two to five years	185		194
Maturities thereafter	345		280
Debt securities, fair value	$	593	$	579

Summary of Maturities for Available-for-sale Debt Securities

The sales proceeds, gains, and losses for available-for-sale debt securities for the periods were:

	Successor								Predecessor
	Three Months Ended September 30, 2024		Three Months Ended September 30, 2023		Nine Months Ended September 30, 2024		May 18 through September 30, 2023		January 1 through May 17, 2023
Sales proceeds of NDT funds investments (a)	$	545	$	492	$	1,578	$	763	$	839
Gross realized gains	4		1		9		1		7
Gross realized losses	(2)		(5)		(8)		(7)		(12)

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(a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.