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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The changes in accumulated other comprehensive loss, net of tax, consist of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Edison International | ​ | ​ | SCE
​ | ​ | Years ended December 31,
(in millions) | ​ | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | ​ | $ | (69) | ​ | $ | (69) | ​ | $ | (41) | ​ | $ | (39)
Pension and PBOP – net loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Other comprehensive income (loss) before reclassifications | ​ |  | 7 | ​ |  | (8) | ​ |  | 4 | ​ |  | (7)
Reclassified from accumulated other comprehensive loss1 | ​ |  | 8 | ​ |  | 8 | ​ |  | 5 | ​ |  | 5
Change | ​ |  | 15 | ​ |  | — | ​ |  | 9 | ​ |  | (2)
Ending Balance | ​ | $ | (54) | ​ | $ | (69) | ​ | $ | (32) | ​ | $ | (41)
​ 1 These items are included in the computation of net periodic pension and PBOP expenses. See Note 9 for additional information.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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