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Commitments and Contingencies (Wildfire Legislation) (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Aug. 01, 2019 | Jun. 30, 2021 | Nov. 30, 2020 | Sep. 30, 2019 | Jul. 31, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Feb. 28, 2021 | Jul. 31, 2020
SCE, SDG&A and PG&E | Wildfire Insurance Fund |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total annual commitment |  |  |  |  | $ 3,000.0 |  |  |  |  |  |
Insurance fund contribution amortization period |  |  |  |  | 10 years |  |  |  |  |  |
Aggregate annual contributions |  |  |  |  |  |  | $ 600.0 |  |  |  |
Revenue collected to support bond issuance |  |  |  |  | $ 10,500.0 |  |  |  |  |  |
SCE and SDG&E | Wildfire Insurance Fund |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial Wildfire Insurance Fund contributions |  |  |  |  | 2,700.0 |  |  |  |  |  |
SCE |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recovery period |  |  |  |  |  | 2 years |  |  |  |  |
Capital expenditures excluded |  | $ 1,600.0 | $ 518.0 |  |  |  |  |  |  |  |
AB 1054 excluded capital expenditures spent |  |  |  |  |  |  | 1,600.0 |  |  |  |
Requested irrevocable order to finance |  |  | 1,000.0 | $ 340.0 |  |  |  |  |  |  |
SCE | Track One |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures excluded |  |  | 219.0 |  |  |  |  |  |  |  |
SCE | Track Two |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures excluded |  |  | $ 299.0 |  |  |  |  |  |  |  |
SCE | Recovery Bonds |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  | $ 338.0 | $ 338.0 |
SCE | Wildfire Insurance Fund |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial Wildfire Insurance Fund contributions |  |  |  |  | 2,400.0 |  | $ 2,600.0 |  |  |  |
Insurance fund contribution amortization period | 15 years |  |  |  |  |  |  | 10 years |  |  |
Amount to be collected from ratepayers |  |  |  |  | $ 6,100.0 |  |  |  |  |  |
Revenue recovery period |  |  |  |  | 15 years |  |  |  |  |  |
Expected annual contribution |  |  |  |  | $ 95.0 |  |  |  |  |  |
Maximum aggregate requirement to reimburse the insurance fund percent |  |  |  |  | 0.20% |  |  |  |  |  |
Minimum weighted-average equity component authorization (as a percent) |  |  |  |  |  |  | 52.00% |  |  |  |
Initial liability cap |  |  |  |  |  |  | $ 3,200.0 |  |  |  |
SDG&E | Wildfire Insurance Fund |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount to be collected from ratepayers |  |  |  |  | $ 1,300.0 |  |  |  |  |  |
PG&E | Wildfire Insurance Fund |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial Wildfire Insurance Fund contributions |  |  |  |  |  |  |  |  |  |  | $ 4,800.0
Amount to be collected from ratepayers |  |  |  |  | $ 6,100.0 |  |  |  |  |  |

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