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Commitments and Contingencies (Recovery of Wildfire-Related Costs) (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended | 14 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2020 | Aug. 01, 2019 | Jul. 12, 2019 | Jul. 28, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Nov. 30, 2018 | Jun. 30, 2020 | Sep. 30, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Anticipated raise from issuance of equity |  |  |  |  |  | $ 1,200 |  |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Wildfire-specific insurance coverage |  |  |  |  |  |  |  | $ 1,000 | $ 1,200 |
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 |  |  | $ 1,600 |  |  |  |  |
AB 1054 Excluded Capital Expenditures |  |  |  |  |  |  |  |  |  | $ 1,100
Southern California Edison | CPUC |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  |  |  |  |  | 52.00% |  |  |
Requested irrevocable order |  |  |  | $ 337 |  |  |  |  |  |
SCE and SDG&E |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Initial contribution |  |  |  |  |  | $ 2,700 |  |  |  |
PG&E |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Initial contribution | $ 4,800 |  |  |  |  |  |  |  |  |
Expected future contribution from ratepayers |  |  | 6,100 |  |  |  |  |  |  |
SCE, SDG&E and PG&E |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Initial contribution |  |  |  |  |  |  | $ 300 |  |  |
Expected annual contribution |  |  | 3,000 |  |  |  |  |  |  |
SDG&E |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Expected future contribution from ratepayers |  |  | $ 1,300 |  |  |  |  |  |  |

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