Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 42	$ 21
Regulatory Liability, Noncurrent		407	383
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		251	223
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	0	0
Regulatory Liability, Noncurrent	[1]	140	144
United States Department of Energy Settlement
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		4	12
Regulatory Liability, Noncurrent		$ 6	3
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		$ 28	5
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		$ 10	4
Regulatory Liability, Noncurrent		$ 10	$ 13

[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.