Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 27, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares shares	Jul. 31, 2021 shares	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) mi² segment $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 01, 2024 $ / shares
Organization
Wildfire insurance fund contributions, noncurrent		$ 1,878			$ 1,878	$ 1,951
Wildfire insurance fund contributions, current		138			138	204
Wildfire insurance fund contributions					95	95	$ 95
Asset retirement obligations		$ 2,580			$ 2,580	2,666
Performance incentive plan award (in shares) | shares		71,000,000			71,000,000
Dividend declared					$ 1,221	$ 1,147	$ 1,083
Dividend increase (decrease) (as a percent)		6.10%			6.10%
Dividends declared per common share (in dollars per share) | $ / shares		$ 3.12			$ 3.1675	$ 2.9925	$ 2.8375
Dividends payable (in dollars per share) | $ / shares										$ 3.31
Antidilutive awards excluded from earnings per share (in shares) | shares					1,533,982	3,771,766	5,839,549
Number of reportable segment | segment					1
Forecast
Organization
Asset impairment charges				$ 10
Subsequent Event
Organization
Dividends declared per common share (in dollars per share) | $ / shares	$ 0.8275
Minimum
Organization
Dividend target payout ratio		45.00%			45.00%
Maximum
Organization
Dividend target payout ratio		55.00%			55.00%
Employee Stock
Organization
Performance incentive plan award (in shares) | shares			3,000,000
Purchase price based on market (as a percent)			97.00%
Maximum payroll deduction | shares			25,000
Employee Stock | Minimum
Organization
Payroll deductions (as a percent)			1.00%
Employee Stock | Maximum
Organization
Payroll deductions (as a percent)			10.00%
Measurement Input
Organization
Historical term used in estimate					10 years	9 years	8 years
Wildfire Insurance Fund
Organization
Wildfire insurance fund contributions, noncurrent		$ 1,900			$ 1,900	$ 2,000
Wildfire insurance fund contributions, current		138			138	204
Wildfire insurance fund contributions								$ 2,400
Wildfire insurance fund liability, noncurrent		363			$ 363	$ 450
Insurance fund contribution amortization period					20 years	15 years	15 years
SCE
Organization
Supply of electricity area covered (in square miles) | mi²					50,000
GHG allowances		66			$ 66	$ 128
GHG emission obligations		22			22	117
Regulatory liabilities		11,506			11,506	10,183
Depreciation					$ 2,800	$ 2,500	$ 2,500
Depreciation expense based on cost (as a percent)					4.30%	4.10%	4.20%
Wildfire insurance fund contributions, noncurrent		1,878			$ 1,878	$ 1,951
Wildfire insurance fund contributions, current		138			138	204
Wildfire insurance fund contributions					95	95	$ 95
Asset retirement obligations		2,580			2,580	2,666	2,754
Franchise fees billed to customers					$ 183	168	172
Weighted-average equity component authorization (as a percent)					52.00%				45.20%
Wildfire related charge incurred after tax									$ 1,800
Weighted-average common equity component authorization period									37 months
Weighted-average common equity component of total capitalization percent (below)									48.70%
Spot rate equity ratio									47.70%
Waiver threshold percent									47.70%
Dividend declared					$ 1,510	$ 1,410	$ 1,325
Dividends declared per common share (in dollars per share) | $ / shares					$ 3.4722	$ 3.2422	$ 3.0468
Severance costs					$ 53
Other restructuring costs					3
SCE | Subsequent Event
Organization
Dividend declared	$ 430
SCE | Minimum
Organization
Weighted-average equity component authorization (as a percent)									48.00%
SCE | Palo Verde and San Onofre Units
Organization
Asset retirement obligations		2,100			2,100
Estimated cost to decommission nuclear facilities		7,600			$ 7,600
Decommissioning cost escalated rates, low end (percent)					2.10%
Decommissioning cost escalated rates, high end (percent)					7.50%
Estimated annual net of tax earnings, low end (percent)					3.60%
Estimated annual net of tax earnings, high end (percent)					5.70%
SCE | LCFS net sales proceeds
Organization
Regulatory liabilities		$ 243			$ 243	$ 248