Regulatory Assets and Liabilities, Regulatory Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[1]	$ 852	$ 528
Regulatory Liability, Noncurrent	[1]	6,010	5,827
Entity's Recorded Provision for Revenue Subject To Refund		3	187
Regulatory assets not currently earning a return		892	1,085
Regulatory assets not currently earning a return		892	1,085
Deferred income tax adjustment and TCJA refunds
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[2]	7	7
Regulatory Liability, Noncurrent	[2]	2,888	3,015
Plant removal costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	0
Regulatory Liability, Noncurrent		2,208	1,984
Effects of regulation on employee benefit costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[3]	0	0
Regulatory Liability, Noncurrent	[3]	259	253
Renewable resources and environmental initiatives
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		16	9
Regulatory Liability, Noncurrent		232	188
Net AROs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[4]	0	0
Regulatory Liability, Noncurrent	[4]	161	90
ITC deferrals
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		0	1
Regulatory Liability, Noncurrent		70	60
Contract valuation adjustments
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[5]	89	56
Regulatory Liability, Noncurrent	[5]	0	0
Deferred electric, natural gas and steam production costs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		480	220
Regulatory Liability, Noncurrent		12	0
Conservation programs
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[6]	52	47
Regulatory Liability, Noncurrent	[6]	$ 0	0
Conservation programs | Minimum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		1 year
Other
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	[7]	$ 205	188
Regulatory Liability, Noncurrent	[7]	143	237
Inflation Reduction Act deferral
Regulatory Liabilities [Line Items]
Regulatory Liability, Current		3	0
Regulatory Liability, Noncurrent		$ 37	$ 0
Inflation Reduction Act deferral | Maximum
Regulatory Liabilities [Line Items]
Regulatory Liability, Amortization Period		3 years

[1] Revenue subject to refund of $3 million and $187 million for 2024 and 2023, respectively, is included in other current liabilities.

[2] Includes the revaluation of recoverable/regulated plant ADIT and revaluation impact of non-plant ADIT due to the TCJA.

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

[4] Includes amounts recorded for future recovery of AROs, less amounts recovered through nuclear decommissioning accruals and gains from decommissioning investments.

[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.

[7] .