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Variable Interest Entities (Trusts) (Details) - SCE | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) MW | Mar. 31, 2020 USD ($) MW | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Common stock | $ 2,168,000,000 |  |  |  |  |  |  | $ 2,168,000,000
Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation value (in dollars per share) | $ / shares |  |  | $ 2,500 |  |  |  |  |
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 Contracts |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Power generating capacity for majority interest (in megawatts) | MW | 3,916 | 4,996 |  |  |  |  |  |
Amount of related party transaction | $ 159,000,000 | $ 151,000,000 |  |  |  |  |  |
Trust II |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  |  |  | $ 400,000,000 |
Trust II | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 220,000,000 |  |  |  |  |  |  | 220,000,000
Trust II | 5.10% Series G (cumulative) |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  |  |  | 5.10% |
Liquidation preference | 220,000,000 |  |  |  |  |  | $ 400,000,000 | 220,000,000
Trust III |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  |  | $ 275,000,000 |  |
Trust III | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 275,000,000 |  |  |  |  |  |  | 275,000,000
Trust III | 5.75% Series H (cumulative) |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  |  | 5.75% |  |
Liquidation preference | 275,000,000 |  |  |  |  | $ 275,000,000 |  | 275,000,000
Trust IV |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  |  | $ 325,000,000 |  |  |
Trust IV | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 325,000,000 |  |  |  |  |  |  | 325,000,000
Trust IV | 5.375% Series J (cumulative) |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  |  | 5.375% |  |  |
Liquidation preference | 325,000,000 |  |  |  | $ 325,000,000 |  |  | 325,000,000
Trust V |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  |  | $ 300,000,000 |  |  |  |
Trust V | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 300,000,000 |  |  |  |  |  |  | 300,000,000
Trust V | 5.45% Series K (cumulative) |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  |  | 5.45% |  |  |  |
Liquidation preference | 300,000,000 |  |  | $ 300,000,000 |  |  |  | 300,000,000
Trust VI |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference |  |  | $ 475,000,000 |  |  |  |  |
Trust VI | Trust Securities [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Liquidation preference | 475,000,000 |  |  |  |  |  |  | 475,000,000
Trust VI | 5.00% Series L (cumulative) |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Security dividend rate, (as a percent) |  |  | 5.00% |  |  |  |  |
Liquidation preference | $ 475,000,000 |  | $ 475,000,000 |  |  |  |  | $ 475,000,000

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