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Equity (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Mar. 31, 2020 | May 31, 2019
ATM |  |  |
Class of Stock [Line Items] |  |  |
Aggregate sales price (up to) |  |  | $ 1,500.0
Shares issued (in shares) |  | 0.4 |
Proceeds received |  | $ 27.0 |
Offering expenses |  | 0.3 |
Aggregate sales price remaining |  | 1,300.0 |
401(k) defined contribution savings plan |  |  |
Class of Stock [Line Items] |  |  |
Proceeds received |  | $ 46.0 |
Issuance of new common stock (in shares) |  | 0.7 |
Stock compensation awards |  |  |
Class of Stock [Line Items] |  |  |
Proceeds received |  | $ 13.0 |
Issuance of new common stock (in shares) |  | 0.3 |
In lieu of dividend payment |  |  |
Class of Stock [Line Items] |  |  |
Proceeds received |  | $ 4.0 |
Issuance of new common stock (in shares) |  | 0.1 |
Southern California Edison |  |  |
Class of Stock [Line Items] |  |  |
Capital contributions | $ 269.0 |  |

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