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Compensation and Benefit Plans (Supplemental Data on Stock Options) (Details) - Stock options - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per option granted (in dollars per share) $ 8.80 $ 8.21 $ 10.65
Fair value of options vested $ 14 $ 14 $ 11
Value of options exercised $ 27 $ 10 $ 126
SCE      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per option granted (in dollars per share) $ 8.83 $ 8.22 $ 10.63
Fair value of options vested $ 7 $ 7 $ 5
Value of options exercised $ 19 $ 7 $ 29