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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 |  |  |  |

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