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Commitments and Contingencies (Recovery of Wildfire-Related Costs) (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 01, 2019 | Jul. 12, 2019 | Sep. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |
Anticipated raise from issuance of equity |  |  | $ 1,200 |  |
SCE and SDG&E |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Initial contribution |  | $ 2,700 |  |  |
Expected annual contribution |  | 1,100 |  |  |
Annual contributions |  | 107 |  |  |
SCE, SDG&E and PG&E |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expected annual contribution |  | 1,900 |  |  |
PG&E |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expected initial contribution |  | 4,800 |  |  |
Expected future contribution from ratepayers |  | 6,100 |  |  |
Southern California Edison |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Initial contribution |  |  | 2,400 |  |
Expected annual contribution |  | 95 |  |  |
Expected future contribution from ratepayers |  | $ 6,100 |  |  |
Anticipated issuance of long-term debt |  |  | $ 1,200 |  |
Maximum aggregate requirement to reimburse the insurance fund percent |  | 20.00% |  |  |
Initial Liability Cap |  | $ 3,000 |  |  |
Excluded wildfire risk mitigation capital expenditures | $ 1,600 |  |  |  |
AB 1054 Excluded Capital Expenditures |  |  |  | $ 601 |
SDG&E |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expected future contribution from ratepayers |  | $ 1,300 |  |  |
Subsequent event | Southern California Edison |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  |  |  | 52.00%

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