Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

The following table provides a rollforward of the AROs reflected in the Registrants’ Consolidated Balance Sheets from December 31, 2021 to December 31, 2023:


	Exelon		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
AROs at December 31, 2021	$	274	$	146	$	29	$	26	$	70	$	45	$	16	$	9
Revisions in estimates of cash flows	(8)		2		(1)		3		(13)		(8)		(3)		(2)

Accretion expense(a)	8		4		1		1		2		2		—		—

Payments	(3)		(2)		(1)		—		—		—		—		—
AROs at December 31, 2022	$	271	$	150	$	28	$	30	$	59	$	39	$	13	$	7
Revisions in estimates of cash flows	(9)		(3)		(1)		1		(6)		(4)		(1)		(1)

Accretion expense(a)	11		6		1		1		3		2		1		—

Payments	(4)		(3)		(1)		—		—		—		—		—
AROs at December 31, 2023	$	269	$	150	$	27	$	32	$	56	$	37	$	13	$	6

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(a)For ComEd, PECO, BGE, DPL and ACE, the majority of the accretion is recorded as an increase to a regulatory asset due to the associated regulatory treatment.