Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 21	$ 4
Regulatory Liability, Noncurrent		$ 383	372
Minimum | Deferred Electric Production And Natural Gas Costs
Regulatory Liabilities [Line Items]
Regulatory Asset, Amortization Period		1 year
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 0	0
Regulatory Liability, Noncurrent		223	201
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	0	0
Regulatory Liability, Noncurrent	[1]	144	152
United States Department of Energy Settlement
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		12	0
Regulatory Liability, Noncurrent		3	14
Deferred Electric Production And Natural Gas Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		5	3
Regulatory Liability, Noncurrent		0	0
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		4	1
Regulatory Liability, Noncurrent		$ 13	$ 5

[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.