Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations [Table Text Block]

AROs consist of the following (in millions):

	As of December 31,
	2022		2021
Trojan decommissioning activities	$	170	$	139
Utility plant	86		95
Non-utility property	33		35
Total asset retirement obligations	289		269
Less: current portion *	32		31
Noncurrent asset retirement obligations	$	257	$	238

*    Current portion of AROs are classified within Accrued expenses and other current liabilities in the consolidated balance sheets.

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following is a summary of the changes in the Company’s AROs (in millions):

	Years Ended December 31,
	2022		2021		2020
Balance as of beginning of year	$	269	$	291	$	279
Liabilities incurred	1		—		3
Liabilities settled	(27)		(18)		(18)
Accretion expense	10		10		10
Revisions in estimated cash flows	36		(14)		17
Balance as of end of year	$	289	$	269	$	291