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Commitments and Contingencies (Upstream Lighting Program) (Details) - SCE - USD ($) $ in Millions | 1 Months Ended | 24 Months Ended | 36 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jan. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Upstream Lighting Program |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Incentives paid to manufacturers |  |  |  |  | $ 91.0
Requested manufacturer incentives refund |  | $ 92.0 |  |  |
Fines |  | 140.0 |  |  |
Remedy offered | $ 21.0 |  |  |  |
Upstream Lighting Program, ESPI |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Incentives received |  |  | $ 1.3 | $ 3.5 |
CPUC requested award refund |  | $ 33.0 |  |  |

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