Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 116	[1]	$ 112
Accretion		5		4
Ending balance		147		116	[1]
Cash flow revisions		26	[2]	0
Electric Plant Steam Production Asbestos
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		54	[1]	52
Accretion		3		2
Ending balance		83		54	[1]
Electric Plant Wind Production [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		52	[1]	50
Accretion		2		2
Ending balance		54		52	[1]
Cash flow revisions	[2]	0
Electric Plant Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		10	[1]	10
Accretion		0		0
Ending balance		10		$ 10	[1]
Cash flow revisions	[2]	0
Electric Plant Steam and Other Production Ash Containment
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Cash flow revisions	[2]	$ 26

[1] No AROs were revised in 2021.

[2] In 2022, AROs were revised for changes in estimates of cash flows. Revisions in steam and other production AROs primarily related to changes in costs for steam production ponds remediation.