Asset Retirement Obligations Asset Retirement Obligations (Tables)

12 Months Ended

Sep. 30, 2022

Asset Retirement Obligation Disclosure [Abstract]


Asset Retirement Obligation Activity (in millions)
	Nuclear		Non-Nuclear		Total
Balance at September 30, 2020	$	3,278	$	3,507	$	6,785
Settlements	(11)		(231)		(242)
Revisions in estimate	12		191		203
Additional obligations	—		43		43

Accretion (recorded as regulatory asset)	149		64		213

Balance at September 30, 2021	3,428		3,574		7,002		(1)

Settlements	(2)		(309)		(311)		(2)
Revisions in estimate	61		186		247


Accretion (recorded as regulatory asset)	156		68		224

Balance at September 30, 2022	$	3,643	$	3,519	$	7,162	(1)

Note

(1) Includes $275 million and $266 million at September 30, 2022 and 2021, respectively, in Current liabilities.

(2) Settlements include the change in asset retirement obligation project accruals included in Accounts payable and accrued liabilities of $20 million.