Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2025

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 three months ended March 31, 2025 and 2024:

	Three Months Ended March 31, 2025						Three Months Ended March 31, 2024
	Nuclear Plant Decommissioning		Land Reclamation, Coal Ash and Other		Total		Nuclear Plant Decommissioning		Land Reclamation, Coal Ash and Other		Total
	(in millions)
Liability at beginning of period	$	3,240	$	838	$	4,078	$	1,742	$	796	$	2,538
Additions:
Accretion (a)	37		11		48		23		10		33
Adjustment for change in estimates (b)	—		(33)		(33)		—		3		3
Adjustment for obligations assumed through acquisition	—		—		—		1,368		—		1,368
Reductions:
Payments	—		(20)		(20)		—		(17)		(17)
Liability at end of period	3,277		796		4,073		3,133		792		3,925
Less amounts due currently	—		(136)		(136)		—		(119)		(119)
Noncurrent liability at end of period	$	3,277	$	660	$	3,937	$	3,133	$	673	$	3,806

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(a)For the three months ended March 31, 2025 and 2024, nuclear plant decommissioning accretion includes $23 million and $9 million, respectively, of accretion expense recognized in operating costs in the condensed consolidated statements of operations and $14 million and $14 million, respectively, reflected as a change in regulatory liability in the condensed consolidated balance sheets.

(b)Includes non-cash adjustments to asset retirement costs included in property, plant, and equipment of $15 million and $1 million for the three months ended March 31, 2025 and 2024, respectively.