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Debt and Credit Agreements (Term loan) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Feb. 28, 2022 | Jan. 31, 2022
0.60% term loan due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount | $ 1,200 |  |
0.60% term loan due 2022 | SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Basis points | 0.60% |  |
0.35% first and refunding mortgage bonds due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount | $ 475 |  |
0.35% first and refunding mortgage bonds due 2022 | SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Basis points | 0.35% |  |
0.47% first and refunding mortgage bonds due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount | $ 550 |  |
0.47% first and refunding mortgage bonds due 2022 | SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Basis points | 0.47% |  |
2.75% first and refunding mortgage bonds due 2032 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  |  | $ 500
Interest rate on debt (as a percent) |  |  | 2.75%
3.45% first and refunding mortgage bonds due 2052 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  |  | $ 700
Interest rate on debt (as a percent) |  |  | 3.45%
Series 2021-A senior secured recovery bonds |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount | $ 338 |  |
Series 2021-A senior secured recovery bonds | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt (as a percent) | 0.86% |  |
Series 2021-A senior secured recovery bonds | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt (as a percent) | 2.51% |  |
Series 2022-A senior secured recovery bonds |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  | $ 533 |
Recovery Bonds, 1.98% due 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  | $ 100 |
Interest rate on debt (as a percent) |  | 1.98% |
Recovery Bonds, 2.94% due 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  | $ 305 |
Interest rate on debt (as a percent) |  | 2.94% |
Recovery Bonds, 3.24% due 2048 |  |  |
Debt Instrument [Line Items] |  |  |
Debt, face amount |  | $ 128 |
Interest rate on debt (as a percent) |  | 3.24% |

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