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Asset Retirement Obligations (Tables)

3 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]


Asset Retirement Obligation Activity (in millions)
	Nuclear		Non-Nuclear		Total
Balance at September 30, 2023	$	3,808	$	3,681	$	7,489	(1)
Settlements	(4)		(59)		(63)
Revisions in estimate	—		78		78


Accretion (recorded as regulatory asset)	43		23		66

Balance at December 31, 2023	$	3,847	$	3,723	$	7,570	(1)

Note

(1) Includes $275 million and $272 million at December 31, 2023, and September 30, 2023, respectively, in Current liabilities.

Revisions to non-nuclear estimates increased the liability balance by $78 million for the three months ended December 31, 2023. The increase was primarily attributable to a change in closure liabilities of $76 million at Cumberland based on scope changes to the interim closure plan and updated cost estimates for activities associated with final closure.