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	[1]	$ 418	$ 271
Regulatory Liability, Noncurrent	[1]	5,569	5,405
Regulatory assets not currently earning a return		1,020	1,718
Other Current Liabilities
Regulatory Liabilities [Line Items]
Entity's Recorded Provision for Revenue Subject To Refund		67	17
Deferred income tax adjustment and TCJA refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[2]	9	26	[3]
Regulatory Liability, Noncurrent	[2]	3,110	3,230	[3]
Plant removal costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[3]
Regulatory Liability, Noncurrent		1,819	1,655	[3]
Effects of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[4]	0	0	[3]
Regulatory Liability, Noncurrent	[4]	247	235	[3]
Renewable resources and environmental initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		6	1	[3]
Regulatory Liability, Noncurrent		173	101	[3]
Sales true-up and revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	9	[3]
Regulatory Liability, Noncurrent		$ 77	41	[3]
Sales true-up and revenue decoupling | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Sales true-up and revenue decoupling | Maximum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		2 years
ITC deferrals
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 1	0	[3]
Regulatory Liability, Noncurrent		61	53	[3]
Formula rates
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		32	19
Regulatory Liability, Noncurrent		$ 17	11
Formula rates | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Formula rates | Maximum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		2 years
Contract valuation adjustments
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[5]	$ 175	56	[3]
Regulatory Liability, Noncurrent	[5]	$ 1	1	[3]
Contract valuation adjustments | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Contract valuation adjustments | Maximum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		2 years
Deferred electric, natural gas and steam production costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 39	50	[3]
Regulatory Liability, Noncurrent		0	0	[3]
Conservation programs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[6]	72	42	[3]
Regulatory Liability, Noncurrent	[6]	$ 0	0	[3]
Conservation programs | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
DOE settlement
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 12	14	[3]
Regulatory Liability, Noncurrent		3	14	[3]
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		72	54	[3]
Regulatory Liability, Noncurrent		$ 61	$ 64	[3]

[1] Revenue subject to refund of $67 million and $17 million for 2022 and 2021, respectively, is included in other current liabilities.

[2] 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.

[3] Prior period amounts have been restated to conform with current year presentation.

[4] Includes regulatory amortization and certain 2018 TCJA benefits approved by the CPUC to offset the PSCo prepaid pension asset.

[5] Includes the fair value of FTR instruments utilized/intended to offset the impacts of transmission system congestion.

[6] Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.