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Commitments and Contingencies (Recovery of Wildfire-Related Costs ) (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Jul. 01, 2020 | Jan. 01, 2020 | Jul. 12, 2019 | Nov. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 25, 2021
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  | 10 years |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 15 years |  |  |  |
SCE and SDG&E |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial contributions |  |  |  |  |  | $ 2,700 |  |  |  |  |
Two annual contributions |  |  |  |  |  |  |  | $ 600 |  |  |
PG&E |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected initial contribution |  | $ 4,800 |  |  |  |  |  |  |  |  |
Initial contribution from ratepayers |  |  |  | $ 6,100 |  |  |  |  |  |  |
PG&E, SCE and SDG&E |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected annual contribution |  |  |  | 3,000 |  |  |  |  |  |  |
SCE |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial contributions |  |  |  |  |  | $ 2,400 |  |  |  |  |
Expected annual contribution |  |  |  | 95 |  |  |  |  |  |  |
Initial contribution from ratepayers |  |  |  | $ 6,100 |  |  |  |  |  |  |
Annual contributions |  |  |  |  |  |  |  | $ 2,600 |  |  |
Amortization period |  |  |  |  |  |  |  | 10 years |  |  |
Fund expected life |  |  |  |  |  |  |  | 15 years |  |  |
Maximum aggregate requirement to reimburse the insurance fund percent |  |  |  | 20.00% |  |  |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  | 52.00% |  |  |  |  |  | 48.00% | 45.20% |
Capital expenditures |  |  |  | $ 1,600 |  |  |  |  |  |  |
AB 1054 excluded capital expenditures |  |  |  |  |  |  |  | $ 1,300 |  |  |
SCE | Subsequent event | Securitized bonds | Securitized bonds |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  |  |  |  |  |  |  |  | $ 338
SCE | CPUC |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested irrevocable order |  |  |  |  | $ 340 |  |  |  |  |  |
SCE | Forecast |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) | 52.00% |  |  |  |  |  |  |  |  |  |
Initial liability cap | $ 3,200 |  |  |  |  |  |  |  |  |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial contribution from ratepayers |  |  |  | $ 1,300 |  |  |  |  |  |  |

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