Nuclear Decommissioning (Tables)

3 Months Ended

Mar. 31, 2021

Schedule Of Nuclear Decommissioning [Line Items]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table provides a rollforward of the nuclear decommissioning ARO reflected in Exelon’s and Generation’s Consolidated Balance Sheets from December 31, 2020 to March 31, 2021:

Nuclear decommissioning ARO at December 31, 2020(a)	$	11,922
Accretion expense	124
Costs incurred related to decommissioning plants	(20)
Nuclear decommissioning ARO at March 31, 2021(a)	$	12,026

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(a)Includes $80 million as the current portion of the ARO at March 31, 2021 and December 31, 2020, which is included in Other current liabilities in Exelon’s and Generation’s Consolidated Balance Sheets.