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]	$ 59	$ 95
Regulatory Liability, Noncurrent	[1]	2,489	2,397
Other Current Liabilities
Regulatory Liabilities [Line Items]
Entity's Recorded Provision for Revenue Subject To Refund		$ 0
Minimum | Deferred Electric, Gas, and Steam Production Costs
Regulatory Liabilities [Line Items]
Regulatory Asset, Amortization Period		1 year
Deferred Income Tax Adjustments and TCJA Refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[2]	$ 2	2	[1]
Regulatory Liability, Noncurrent	[2]	1,298	1,328	[1]
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[1]
Regulatory Liability, Noncurrent		705	651	[1]
Effects of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[3]	0	0	[1]
Regulatory Liability, Noncurrent	[3]	227	216	[1]
Renewable Resources and Environmental Initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0	[1]
Regulatory Liability, Noncurrent		141	91	[1]
ITC Deferrals
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		1	0	[1]
Regulatory Liability, Noncurrent		41	42	[1]
Sales True Up and Revenue Decoupling [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	9	[1]
Regulatory Liability, Noncurrent		$ 55	41	[1]
Sales True Up and Revenue Decoupling [Member] | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Sales True Up and Revenue Decoupling [Member] | Maximum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		2 years
Conservation programs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 19	34	[1]
Regulatory Liability, Noncurrent		$ 0	0	[1]
Conservation programs | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Deferred Electric, Gas, and Steam Production Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 3	29	[1]
Regulatory Liability, Noncurrent		0	0	[1]
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		18	11	[1]
Regulatory Liability, Noncurrent		22	28	[1]
Formula rates
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		16	10	[1]
Regulatory Liability, Noncurrent		$ 0	$ 0	[1]
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

[1] Revenue subject to refund of $0 million and $2 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] Includes regulatory amortization and certain 2018 TCJA benefits approved by the CPUC to offset the prepaid pension asset.