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Compensation and Benefit Plans (Effect of Change in One Percent) (Details) - Postretirement Benefits Other Than Pensions
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Effect on ABO of one-percentage-point increase in assumed health care cost trend rate $ 225
Effect on ABO of one-percentage-point decrease in assumed health care cost trend rate (184)
Effect on annual aggregate service and interest costs of one-percentage-point increase in assumed health care cost trend rate 10
Effect on annual aggregate service and interest costs of one-percentage-point decrease in assumed health care cost trend rate (8)
SCE  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Effect on ABO of one-percentage-point increase in assumed health care cost trend rate 224
Effect on ABO of one-percentage-point decrease in assumed health care cost trend rate (183)
Effect on annual aggregate service and interest costs of one-percentage-point increase in assumed health care cost trend rate 10
Effect on annual aggregate service and interest costs of one-percentage-point decrease in assumed health care cost trend rate $ (8)