Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 29	$ 42
Regulatory Liability, Noncurrent		456	407
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		276	251
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	0	0
Regulatory Liability, Noncurrent	[1]	134	140
United States Department of Energy Settlement
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		4	4
Regulatory Liability, Noncurrent		$ 4	6
United States Department of Energy Settlement | Minimum
Regulatory Liabilities [Line Items]
Regulatory liabilities		1 year
United States Department of Energy Settlement | Maximum
Regulatory Liabilities [Line Items]
Regulatory liabilities		2 years
Deferred Electric Production And Natural Gas Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 13	28
Regulatory Liability, Noncurrent		$ 0	0
Deferred Electric Production And Natural Gas Costs | Minimum
Regulatory Liabilities [Line Items]
Regulatory liabilities		1 year
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 9	10
Regulatory Liability, Noncurrent		5	10
Inflation Reduction Act deferral
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		3	0
Regulatory Liability, Noncurrent		$ 37	$ 0
Inflation Reduction Act deferral | Minimum
Regulatory Liabilities [Line Items]
Regulatory liabilities		1 year
Inflation Reduction Act deferral | Maximum
Regulatory Liabilities [Line Items]
Regulatory liabilities		3 years

[1] Includes the revaluation of recoverable/regulated plant accumulated deferred income taxes and revaluation impact of non-plant accumulated deferred income taxes due to the TCJA.