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Nuclear Decommissioning (Tables)
 3 Months Ended
Mar. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
The following table provides a rollforward of the nuclear decommissioning AROs reflected in the Consolidated Balance Sheets from December 31, 2023 to March 31, 2024:
Balance as of December 31, 2023(a)
$13,891 
Accretion expense164 
Costs incurred related to decommissioning plants(8)
Balance as of March 31, 2024(a)
$14,047 
__________
(a)Includes $28 million and $30 million as the current portion of the ARO as of March 31, 2024 and December 31, 2023, respectively, which is included in Other current liabilities in the Consolidated Balance Sheets.
Related Party Transactions - Noncurrent Receivables from/Payables to affiliates
The following table presents our noncurrent payables to ComEd, PECO, CenterPoint, and AEP Texas reflected as Payables related to Regulatory Agreement Units in the Consolidated Balance Sheets as of March 31, 2024 and December 31, 2023:
March 31, 2024December 31, 2023
ComEd$3,078 $2,955 
PECO304 278 
CenterPoint
365 338 
AEP Texas
127 117 
Payables related to Regulatory Agreement Units$3,874 $3,688