Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 167	$ 153
Amounts Incurred	[1]		9
Accretion		7	7
Ending balance		174	167
Cash flow revisions			(2)
Electric Plant Steam Production Asbestos
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		102	87
Amounts Incurred	[1]		9
Accretion		5	5
Ending balance		107	102
Cash flow revisions			1
Electric Plant Wind Production [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		55	56
Amounts Incurred	[1]		0
Accretion		2	2
Ending balance		57	55
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

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