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Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2021
Income Tax Disclosure [Abstract] |
Reconciliation of Income Tax Expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Edison International |  | SCE |
​ | ​ | Three months ended March 31, | ​
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Income from operations before income taxes | ​ | $ | 254 | ​ | $ | 129 | ​ | $ | 299 | ​ | $ | 174 | ​
Provision for income tax at federal statutory rate of 21% | ​ |  | 53 | ​ |  | 27 | ​ |  | 63 | ​ |  | 37 | ​
Increase (decrease) in income tax from: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
State tax, net of federal benefit | ​ |  | (7) | ​ |  | (13) | ​ |  | (4) | ​ |  | (12) | ​
Property-related | ​ |  | (83) | ​ |  | (78) | ​ |  | (83) | ​ |  | (78) | ​
Change related to uncertain tax position1 | ​ |  | — | ​ |  | (15) | ​ |  | — | ​ |  | (17) | ​
Other | ​ |  | 1 | ​ |  | (5) | ​ |  | — | ​ |  | (5) | ​
Total income tax benefit | ​ | $ | (36) | ​ | $ | (84) | ​ | $ | (24) | ​ | $ | (75) | ​
Effective tax rate | ​ |  | (14.2) | % |  | (65.1) | % |  | (8.0) | % |  | (43.1) | %
1 | Primarily relates to the re-measurement of uncertain tax positions related to the 2010 – 2012 California state tax filings currently under audit.

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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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