Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 153	$ 147
Amounts Incurred	[1]	9
Accretion		7	6
Ending balance		167	153
Cash flow revisions		(2)
Electric Plant Steam Production Asbestos
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		87	83
Accretion		5	4
Ending balance		102	87
Electric Plant Wind Production [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		56	54
Amounts Incurred	[1]	0
Accretion		2	2
Ending balance		55	56
Cash flow revisions		(3)
Electric Plant Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		10	10
Amounts Incurred	[1]	0
Accretion		0	0
Ending balance		10	$ 10
Cash flow revisions		0
Electric Plant Steam and Other Production Ash Containment
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Amounts Incurred	[1]	9
Cash flow revisions		$ 1

[1] Amounts incurred pertain to CCR coal ash regulations and the Harrington pipeline which was placed in service in 2024.