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Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |  |
Statutory tax rate (as a percent) |  | 21.00% |  |
Income from operations before income taxes |  | $ 789 | $ 566 | $ 1,127
Provision for income tax at federal statutory rate of 21% |  | 166 | 119 | 237
Increase (decrease) in income tax from: |  |  |  |
State tax, net of federal benefit |  | (47) | (61) | (22)
Property-related |  | (233) | (320) | (303)
Change related to uncertain tax position |  | (147) | (15) |
Deferred tax re-measurement |  |  |  | (88)
2018 GRC Final Decision |  |  |  | (80)
Wildfire related charges |  | 31 |  |
Average rate assumption method ("ARAM") adjustment |  | 87 |  |
Corporate-owned life insurance cash surrender value |  | (8) | (8) | (8)
Other |  | 15 | (20) | (14)
Total income tax (benefit) expense |  | $ (136) | $ (305) | $ (278)
Effective tax rate (as a percent) |  | (17.20%) | (53.90%) | (24.70%)
SCE |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Income from operations before income taxes |  | $ 952 | $ 665 | $ 1,301
Provision for income tax at federal statutory rate of 21% |  | 200 | 140 | 273
Increase (decrease) in income tax from: |  |  |  |
State tax, net of federal benefit |  | (33) | (52) | (13)
Property-related |  | (233) | (320) | (303)
Change related to uncertain tax position |  | (37) | (19) |
Deferred tax re-measurement |  |  |  | (88)
2018 GRC Final Decision |  |  |  | (80)
Wildfire related charges |  | 31 |  |
Average rate assumption method ("ARAM") adjustment | $ 87 | 87 |  |
Corporate-owned life insurance cash surrender value |  | (8) | (8) | (8)
Other |  | 10 | (18) | (10)
Total income tax (benefit) expense |  | $ 17 | $ (277) | $ (229)
Effective tax rate (as a percent) |  | 1.80% | (41.70%) | (17.60%)

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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