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Equity (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued | 32,200,000 |  |  |  |  |  |  |
Offering expenses | $ 52 |  |  |  |  |  |  |
Issuance of preference or common stock | 2,200 | $ 198 |  |  | $ 2,421 |  | $ 462 |
Common stock issued |  |  |  |  | 2,391 | $ 0 | 0 |
Wildfire Insurance Fund contributions |  |  |  |  | 2,457 | 0 | 0 |
Southern California Edison Company |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of preference or common stock |  |  |  |  |  |  | 462 |
Wildfire Insurance Fund contributions | $ 2,400 |  | $ 2,400 |  | $ 2,457 | $ 0 | $ 0 |
Southern California Edison Company | Cumulative preferred stock $100 par value |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 100 |  | $ 100 | $ 100 |  |  |
Preferred stock, shares authorized |  | 12,000,000 |  | 12,000,000 | 12,000,000 |  |  |
Southern California Edison Company | Cumulative preferred stock $25 par value |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 25 |  | $ 25 | $ 25 |  |  |
Preferred stock, shares authorized |  | 24,000,000 |  | 24,000,000 | 24,000,000 |  |  |
Southern California Edison Company | No par value |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 50,000,000 |  | 50,000,000 | 50,000,000 |  |  |
Southern California Edison Company | Preferred and Preference Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  | 0 | 0 | 0 |
Preferred stock, shares redeemed |  |  |  |  | 0 | 0 | 0 |
At-the-market Program (ATM) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate sale price |  | $ 1,300 |  | $ 1,300 | $ 1,300 |  |  | $ 1,500
Preferred stock, shares issued |  | 2,800,000 |  |  |  |  |  |
Offering expenses |  | $ 2 |  |  |  |  |  |
Internal programs |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 600,000 |  |  |  |
Common stock issued in lieu of distributing dividends |  |  |  | $ 8 |  |  |  |
401(K) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 400,000 |  |  |  |
Common stock issued |  |  |  | $ 41 |  |  |  |
In lieu of dividend payment |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 100,000 |  |  |  |
Common stock issued |  |  |  | $ 22 |  |  |  |

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