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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Reconciliation of Income Tax Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30, | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Edison International: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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 1 | ​ | ​ | 87 | ​ | ​ | — | ​ | ​ | 87 | ​ | ​ | — | ​
Change related to uncertain tax position2 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (15) | ​
Insurance benefits | ​ | ​ | (2) | ​ | ​ | (5) | ​ | ​ | (7) | ​ | ​ | (12) | ​
Wildfire related charges3 | ​ | ​ | 31 | ​ | ​ | — | ​ | ​ | 31 | ​ | ​ | — | ​
Other | ​ |  | (5) | ​ |  | (14) | ​ |  | 4 | ​ |  | (19) | ​
Total income tax expense (benefit) | ​ | $ | (29) | ​ | $ | (275) | ​ | $ | 3 | ​ | $ | (355) | ​
Effective tax rate | ​ |  | (8.9) | % |  | (53.2) | % |  | 0.8 | % |  | (986.1) | %
SCE: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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) | ​
ARAM adjustment 1 | ​ | ​ | 87 | ​ | ​ | — | ​ | ​ | 87 | ​ | ​ | — | ​
Change related to uncertain tax position2 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (18) | ​
Insurance benefits | ​ | ​ | (2) | ​ | ​ | (5) | ​ | ​ | (7) | ​ | ​ | (12) | ​
Wildfire related charges3 | ​ | ​ | 31 | ​ | ​ | — | ​ | ​ | 31 | ​ | ​ | — | ​
Other | ​ |  | (6) | ​ |  | (6) | ​ |  | 3 | ​ |  | (10) | ​
Total income tax expense (benefit) | ​ | $ | (11) | ​ | $ | (251) | ​ | $ | 41 | ​ | $ | (300) | ​
Effective tax rate | ​ |  | (4.1) | % |  | (53.5) | % |  | 8.3 | % |  | (211.3) | %
1 | In July 2021, SCE received the IRS's response to its private letter ruling request, regarding the scope of the deferred tax normalization requirements and the computations required to comply with the average rate assumption method. As a result, SCE's estimate changed and a cumulative true up of $87 million reduction in tax benefits was recorded in the third quarter of 2021, for the period of January 1, 2018 to June 30, 2021. The above true up has an offsetting revenue adjustment resulting in no impact on earnings.
2 | Primarily relates to the re-measurement of uncertain tax positions related to the 2010 – 2012 California state tax filings currently under audit.
3 | Relates to portions of the estimated charge for the 2017/2018 Wildfire/Mudslide Events recorded in the third quarter of 2021, assumed to be non-deductible for tax purposes.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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