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Asset Retirement Obligations and Accrued Environmental Costs (Tables)
 6 Months Ended
Jun. 30, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Asset Retirement Obligations and Accrued Environmental Costs
Successor

June 30, 2024December 31, 2023
Asset retirement obligations$484 $464 
Accrued environmental costs23 23 
Total asset retirement obligations and accrued environmental costs507 487 
Less: asset retirement obligations and accrued environmental costs due within one year (a)
34 18 
Asset retirement obligations and accrued environmental costs due after one year$473 $469 
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(a)Presented as “Other current liabilities” on the Consolidated Statements of Operations.
Schedule of Changes in Asset Retirement Obligations
The changes of the ARO carrying value were:
ARO
Rollforward
Carrying value, December 31, 2023 (Successor)$464 
Obligations settled(7)
Accretion expense27 
Carrying value, June 30, 2024 (Successor)$484 
Schedule of Asset Retirement Obligations
Supplemental information for the ARO:
Successor

June 30, 2024December 31,
2023
Supplemental Information
Nuclear (a)
$227 $214 
Non-Nuclear (b)
257 250 
Carrying value$484 $464 
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(a)Obligations are expected to be settled with available funds in the NDT at the time of decommissioning.
(b)Certain obligations are: (i) partially supported by surety bonds, some of which have been collateralized with cash and (or) LCs; or (ii) partially prefunded under phased installment agreements.