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Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | May 31, 2019
Class of Stock [Line Items] |  |  |  |
Shares issued (in shares) | 14,181,882 |  |  |
Proceeds received | $ 800.0 |  |  |
Offering expenses | $ 14.0 |  |  |
Redemption of preferred and preference stock |  | $ (308.0) |  |
ATM |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued (in shares) |  | 0 | 391,501 |
Proceeds received |  |  | $ 27.0 |
Offering expenses |  |  | 0.3 |
Aggregate sales price (up to) |  |  |  | $ 1,500.0
Aggregate sales price remaining |  | $ 1,300.0 | 1,300.0 |
401(k) defined contribution savings plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds received |  | $ 11.0 | $ 83.0 |
Issuance of new common stock (in shares) |  | 206,900 | 1,378,700 |
Stock compensation awards |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds received |  | $ 1.0 | $ 14.0 |
Issuance of new common stock (in shares) |  | 4,749 | 338,442 |
In lieu of dividend payment |  |  |  |
Class of Stock [Line Items] |  |  |  |
Proceeds received |  | $ 4.0 | $ 13.0 |
Issuance of new common stock (in shares) |  | 77,250 | 206,269 |
Southern California Edison |  |  |  |
Class of Stock [Line Items] |  |  |  |
Capital contributions |  | $ 219.0 | $ 1,100.0 |
Redemption of preferred and preference stock |  | $ 120.0 | $ 308.0 |
Southern California Edison | 4.32% Series |  |  |  |
Class of Stock [Line Items] |  |  |  |
Security dividend rate, (as a percent) |  | 4.32% |  |
Redemption price (in dollars per share) |  | $ 28.75 | $ 28.75 |
Southern California Edison | 4.08% Series |  |  |  |
Class of Stock [Line Items] |  |  |  |
Security dividend rate, (as a percent) |  | 4.08% |  |
Redemption price (in dollars per share) |  | $ 25.50 | 25.50 |
Southern California Edison | 4.24% Series |  |  |  |
Class of Stock [Line Items] |  |  |  |
Security dividend rate, (as a percent) |  | 4.24% |  |
Redemption price (in dollars per share) |  | $ 25.80 | 25.80 |
Southern California Edison | 4.78% Series |  |  |  |
Class of Stock [Line Items] |  |  |  |
Security dividend rate, (as a percent) |  | 4.78% |  |
Redemption price (in dollars per share) |  | $ 25.80 | $ 25.80 |
Southern California Edison | Series G Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Redemption of preferred and preference stock |  | $ 180.0 |  |
Redemption Premium |  | $ 15.0 |  |

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