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Variable Interest Entities (Trusts) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) MW | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redemption of trust securities |  | $ 308,000,000 |  |  |  |  |  |
SCE |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Redemption of trust securities |  | 308,000,000 |  |  |  |  |  |
SCE | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) | $ / shares |  |  | $ 2,500 |  |  |  |  |
SCE | 5.10% Series G Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) | 5.10% |  |  |  |  |  |  |
Redemption of trust securities |  | 180,000,000 |  |  |  |  |  |
SCE | 5.75% Series H Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) | 5.75% |  |  |  |  |  |  |
SCE | 5.375% Series J Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) | 5.375% |  |  |  |  |  |  |
SCE | 5.45% Series K Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) | 5.45% |  |  |  |  |  |  |
SCE | 5.00% Series L Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) | 5.00% |  |  |  |  |  |  |
SCE | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) | $ / shares |  |  | $ 25 |  |  |  |  |
Common stock | $ 10,000 | $ 10,000 | $ 10,000 |  |  |  |  |
SCE | Power Purchase Agreement |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Power generating capacity for majority interest (in megawatts) | MW | 3,545 | 5,103 |  |  |  |  |  |
Amount of related party transaction | $ 673,000,000 | $ 744,000,000 |  |  |  |  |  |
SCE | Trust II |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  |  |  | $ 400,000,000 |
SCE | Trust II | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 220,000,000 | 220,000,000 |  |  |  |  |  |
SCE | Trust II | 5.10% Series G Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  |  |  | 5.10% |
Liquidation preference | 220,000,000 | 220,000,000 |  |  |  |  | $ 400,000,000 |
SCE | Trust III |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  |  | $ 275,000,000 |  |
SCE | Trust III | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 275,000,000 | 275,000,000 |  |  |  |  |  |
SCE | Trust III | 5.75% Series H Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  |  | 5.75% |  |
Liquidation preference | 275,000,000 | 275,000,000 |  |  |  | $ 275,000,000 |  |
SCE | Trust IV |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  | $ 325,000,000 |  |  |
SCE | Trust IV | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 325,000,000 | 325,000,000 |  |  |  |  |  |
SCE | Trust IV | 5.375% Series J Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  | 5.375% |  |  |
Liquidation preference | 325,000,000 | 325,000,000 |  |  | $ 325,000,000 |  |  |
SCE | Trust V |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  | $ 300,000,000 |  |  |  |
SCE | Trust V | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 300,000,000 | 300,000,000 |  |  |  |  |  |
SCE | Trust V | 5.45% Series K Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.45% |  |  |  |
Liquidation preference | 300,000,000 | 300,000,000 |  | $ 300,000,000 |  |  |  |
SCE | Trust VI |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  |  |  |  | $ 475,000,000
SCE | Trust VI | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 475,000,000 | 475,000,000 |  |  |  |  |  | $ 475,000,000
SCE | Trust VI | 5.00% Series L Preferred Stock |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  | 5.00% |  |  |  |  |
Liquidation preference | $ 475,000,000 | $ 475,000,000 |  |  |  |  |  |

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