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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, Edison International (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Edison International:              
Beginning balance $ 18,861 $ 18,797 $ 17,868 $ 17,615 $ 17,944 $ 17,740 $ 17,944
Pension and PBOP:              
Other comprehensive income, net of tax 0 2 2 1   2 3
Ending Balance 19,330 18,861 18,107 17,868 17,615 19,330 18,107
Accumulated Other Comprehensive Income              
Edison International:              
Beginning balance 2 0 (8) (9) (9) 0 (9)
Pension and PBOP:              
Other comprehensive income, net of tax   2 2 1      
Ending Balance 2 $ 2 (6) $ (8) $ (9) 2 (6)
Reclassified from accumulated other comprehensive loss              
Pension and PBOP:              
Reclassified from accumulated other comprehensive loss 0   1     1 2
Foreign currency translation adjustments              
Pension and PBOP:              
Foreign currency translation adjustments $ 0   $ 1     $ 1 $ 1