Asset Retirement Obligations and Accrued Environmental Costs (Tables)

9 Months Ended

Sep. 30, 2024

Asset Retirement Obligation Disclosure [Abstract]

Summary of Asset Retirement Obligations and Accrued Environmental Costs

	Successor
	September 30, 2024		December 31, 2023
Asset retirement obligations	$	495	$	464
Accrued environmental costs	22		23
Total asset retirement obligations and accrued environmental costs	517		487
Less: asset retirement obligations and accrued environmental costs due within one year (a)	42		18
Asset retirement obligations and accrued environmental costs due after one year	$	475	$	469

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(a)Presented as “Other current liabilities” on the Consolidated Balance Sheets.

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	(9)
Accretion expense	40
Carrying value, September 30, 2024 (Successor)	$	495

Schedule of Asset Retirement Obligations

Supplemental information for the ARO:

	Successor
	September 30, 2024		December 31, 2023
Supplemental Information
Nuclear (a)	$	234	$	214
Non-Nuclear (b)	261		250
Carrying value	$	495	$	464

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(a)Obligations are expected to be settled with available funds in the NDT at the time of decommissioning. See Note 12 for additional information on the NDT.

(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.