Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		$ 70	$ 59
Regulatory Liability, Noncurrent		$ 2,562	2,489
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	[1]	$ 2	2
Regulatory Liability, Noncurrent	[1]	1,260	1,298
Plant Removal Costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		769	705
Effects of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[2]	0	0
Regulatory Liability, Noncurrent	[2]	234	227
Renewable Resources and Environmental Initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		152	141
ITC Deferrals
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		1	1
Regulatory Liability, Noncurrent		44	41
Sales True Up and Revenue Decoupling [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		63	55
Conservation programs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		9	19
Regulatory Liability, Noncurrent		$ 0	0
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		$ 34	3
Regulatory Liability, Noncurrent		0	0
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		16	18
Regulatory Liability, Noncurrent		40	22
Formula rates
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		8	16
Regulatory Liability, Noncurrent		$ 0	$ 0
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] 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.

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