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Nuclear Decommissioning Trust Funds (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds
Successor
December 31, 2024December 31, 2023
Amortized CostUnrealized GainsUnrealized LossesFair ValueAmortized CostUnrealized GainsUnrealized LossesFair Value
Cash equivalents$3 $— $— $3 $9 $— $— $9 
Equity securities509 651 55 1,105 491 575 53 1,013 
Debt securities615 3 7 611 570 10 1 579 
Receivables (payables), net5 — — 5 (26)— — (26)
NDT funds$1,132 $654 $62 $1,724 $1,044 $585 $54 $1,575 
Summary of Available-for-Sale Debt Securities with Unrealized Losses The aggregate related fair value of available-for-sale debt securities with unrealized losses as of December 31, 2024 (Successor) were:
Fair ValueUnrealized Losses
Corporate debt securities$71 $(2)
Municipal debt securities60(1)
U.S. Government debt securities226(4)
Debt securities in unrealized loss position $357 $(7)
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
December 31, 2024December 31, 2023
Maturities within one year$82 $105 
Maturities within two to five years220 194 
Maturities thereafter309 280 
Debt securities, fair value$611 $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:
SuccessorPredecessor
Year Ended December 31, 2024May 18 through December 31, 2023January 1 through May 17, 2023Year Ended December 31, 2022
Sales proceeds of NDT funds investments (a)
$2,132 $1,259 $839 $2,081 
Gross realized gains12 5 7 10 
Gross realized losses(13)(11)(12)(43)
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(a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.