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Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Line Items] |  |  |  |  |
Statutory tax rate (as a percent) |  |  |  | 21.00% |
(Loss) income from operations before income taxes |  | $ (326) | $ (517) | $ 357 | $ (36)
Provision for income tax at federal statutory rate of 21% |  | (68) | (108) | 75 | (7)
Increase (decrease) in income tax from: |  |  |  |  |
State tax, net of federal benefit |  | (39) | (67) | (28) | (74)
Property-related |  | (33) | (81) | (159) | (228)
Average rate assumption method ("ARAM") adjustment |  | 87 |  | 87 |
Change related to uncertain tax position |  |  |  |  | (15)
Insurance benefits |  | (2) | (5) | (7) | (12)
Wildfire related charges |  | 31 |  | 31 |
Other |  | (5) | (14) | 4 | (19)
Total income tax expense (benefit) |  | $ (29) | $ (275) | $ 3 | $ (355)
Effective tax rate (as a percent) |  | (8.90%) | (53.20%) | 0.80% | (986.10%)
State | Plan |  |  |  |  |
Increase (decrease) in income tax from: |  |  |  |  |
Tax refund | $ 60 |  |  |  |
Tax settlement increase (decrease) on earnings | $ 148 |  |  |  |
SCE |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Statutory tax rate (as a percent) |  |  |  | 21.00% |
(Loss) income from operations before income taxes |  | $ (268) | $ (469) | $ 492 | $ 142
Provision for income tax at federal statutory rate of 21% |  | (56) | (98) | 103 | 30
Increase (decrease) in income tax from: |  |  |  |  |
State tax, net of federal benefit |  | (32) | (61) | (17) | (62)
Property-related |  | (33) | (81) | (159) | (228)
Average rate assumption method ("ARAM") adjustment |  | 87 |  | 87 |
Change related to uncertain tax position |  |  |  |  | (18)
Insurance benefits |  | (2) | (5) | (7) | (12)
Wildfire related charges |  | 31 |  | 31 |
Other |  | (6) | (6) | 3 | (10)
Total income tax expense (benefit) |  | $ (11) | $ (251) | $ 41 | $ (300)
Effective tax rate (as a percent) |  | (4.10%) | (53.50%) | 8.30% | (211.30%)
Revenue adjustment |  | $ 0 |  |  |

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