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Summary of Significant Accounting Policies (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 22, 2024 | Dec. 31, 2023 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2023
Significant Accounting Policies [Line Items] |  |  |  |  |
Dividend increase (decrease) (as a percent) |  | 5.80% |  |  |
Dividends (in dollars per share) | $ 0.78 | $ 3.12 |  |  | $ 2.95
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Dividend target payout ratio |  | 45.00% |  |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Dividend target payout ratio |  | 55.00% |  |  |
SCE |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted-average equity component authorization (as a percent) |  | 52.00% | 48.00% | 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% |
Dividends | $ 360 |  |  |  |
SCE | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Weighted-average equity component authorization (as a percent) |  |  |  | 48.00% |

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