Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2024

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

The following table summarizes the changes to our current and noncurrent ARO liabilities for the years ended December 31, 2024 and 2023:

	Nuclear Plant Decommissioning		Land Reclamation, Coal Ash and Other		Total
	(in millions)
Liability at December 31, 2022	$	1,688	$	749	$	2,437
Additions:
Accretion (a)	54		34		88
Adjustment for change in estimates (b)	—		94		94
Reductions:
Payments	—		(81)		(81)
Liability at December 31, 2023	1,742		796		2,538
Additions:
Accretion (a)	130		40		170
Adjustment for change in estimates (b)	—		90		90
Adjustment for obligations assumed through acquisitions	1,368		—		1,368
Reductions:
Payments	—		(88)		(88)
Liability at December 31, 2024	3,240		838		4,078
Less amounts due currently	—		(142)		(142)
Noncurrent liability at December 31, 2024	$	3,240	$	696	$	3,936

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(a)For the year ended December 31, 2024, nuclear plant decommissioning accretion includes $74 million of accretion expense recognized in operating costs in the consolidated statements of operations and $56 million reflected as a change in regulatory liability in the consolidated balance sheets. For the year ended December 31, 2023, nuclear plant decommissioning accretion reflected as a change in regulatory liability in the consolidated balance sheets.

(b)Includes non-cash additions to asset retirement costs included in property, plant, and equipment of $52 million and $67 million for the years ended December 31, 2024 and 2023, respectively.