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Summary of Significant Accounting Policies (SCE Dividends) (Details) - SCE - USD ($) $ in Millions |  |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Feb. 27, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  | 48.00% | 45.20% |
Spot rate equity ratio |  |  |  | 47.00% |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) |  |  | 37 months |  |
Waiver threshold percent |  |  | 47.00% |  |
Weighted-average common equity component of total capitalization percent (below) |  |  | 48.50% |  |
Wildfire related charge incurred after tax |  |  |  |  | $ 2,000
Capacity to pay additional dividends |  |  | $ 179 |  |
Restriction on net assets |  |  | $ 17,600 |  | $ 17,600
Weighted-average common equity component of total capitalization percent with CPUC waiver |  |  | 49.60% |  |
Subsequent event |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  | 52.00% |  |  |
Dividends | $ 269 |  |  |  |

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