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Summary of Significant Accounting Policies - Schedule of EPS Available to Edison International Common Shareholders (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic earnings per share:        
Net income available to Edison International common shareholders $ 832 $ 516 $ 2,611 $ 944
Earnings allocated to participating securities 0 0 (1) 0
Income available to common shareholders $ 832 $ 516 $ 2,610 $ 944
Weighted average common shares outstanding (in shares) 385 387 385 386
Basic earnings per share (in dollars per share) $ 2.16 $ 1.33 $ 6.78 $ 2.45
Diluted earnings per share:        
Income available to common shareholders $ 832 $ 516 $ 2,610 $ 944
Add back: Earnings allocated to participating securities 0 0 1 1
Net income available to Edison International common shareholders $ 832 $ 516 $ 2,611 $ 945
Weighted average common shares outstanding (in shares) 385 387 385 386
Effect of dilutive securities (in shares) 1 3 1 2
Adjusted weighted average shares - diluted (in shares) 386 390 386 388
Diluted earnings per share (in dollars per share) $ 2.16 $ 1.32 $ 6.76 $ 2.44