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Compensation and Benefit Plans (Supplemental Data on Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash from participants to exercise stock options $ 215 $ 135 $ 128
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per option granted (dollars per share) $ 10.65 $ 7.38 $ 7.54
Fair value of options vested $ 11 $ 11 $ 20
Cash used to purchase shares to settle options 293 220 170
Cash from participants to exercise stock options 167 136 113
Value of options exercised 126 84 57
Tax benefits from options exercised 51 34 23
SCE      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash from participants to exercise stock options $ 48 $ 76 $ 68
SCE | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per option granted (dollars per share) $ 10.63 $ 7.50 $ 7.53
Fair value of options vested $ 5 $ 5 $ 11
Cash used to purchase shares to settle options 77 118 69
Cash from participants to exercise stock options 48 77 45
Value of options exercised 29 41 24
Tax benefits from options exercised $ 12 $ 17 $ 10