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Equity (Quarter) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | May 31, 2019
Class of Stock [Line Items] |  |  |  |
Equity contribution | $ 575 |  |  |
Series A Preferred Stock, 5.375% |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) | 1,250,000 |  |  |
Proceeds received, net of offering costs | $ 1,200 |  |  |
Preferred Stock, dividend rate, (as a percent) | 5.375% |  |  |
Liquidation value (in dollars per share) | $ 1,000 |  |  |
Dividend reset period | 5 years |  |  |
Margin rate for dividend rate reset (as a percent) | 4.698% |  |  |
Redemption amount (in dollars per share) | $ 1,000 |  |  |
Redemption amount following change in criteria (in dollars per share) | $ 1,020 |  |  |
SCE |  |  |  |
Class of Stock [Line Items] |  |  |  |
Capital contributions |  | $ 83 | $ 1,300 |
At-the-market Program (ATM) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) |  | 0 | 0 |
Aggregate sale price |  |  |  | $ 1,500
Aggregate sales price remaining |  | $ 1,300 | $ 1,300 |
401(K) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) |  | 52,100 | 465,400 |
Proceeds received, net of offering costs |  | $ 3 | $ 27 |
Stock compensation awards |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) |  | 54,970 | 267,564 |
Proceeds received, net of offering costs |  | $ 2 | $ 7 |
In lieu of dividend payment |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) |  | 77,468 | 225,383 |
Proceeds received, net of offering costs |  | $ 5 | $ 13 |
Optional cash investments | Edison International |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issued (in shares) |  |  | 21,792 |
Proceeds received, net of offering costs |  |  | $ 1 |

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