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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) - Postretirement Benefits Other Than Pensions - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net plan assets available for benefits $ 2,133 $ 2,330 $ 2,102
Corporate stocks | Russell Indexes      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark, percentage 67.00% 64.00%  
Corporate stocks | MSCI All Country World Index      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark, percentage 33.00% 36.00%  
Common/collective funds | MSCI-EAFE      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 74.00% 75.00%  
Common/collective funds | Non-index U.S. equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 19.00% 17.00%  
Partnerships | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 48.00% 56.00%  
Partnerships | Broad range of financial assets in all global markets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 34.00% 33.00%  
Partnerships | Asset backed securities including distressed mortgages      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 17.00% 9.00%  
Other | Municipal securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 58 $ 60  
Collateralized mortgage obligations and other asset backed securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Receivables and payables, net 59 36  
SCE      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2,155 2,349  
Fair value NAV 584 651  
Receivables and payables, net (22) (19)  
Net plan assets available for benefits 2,133 2,330 $ 2,102
SCE | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 591 736  
SCE | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 980 962  
SCE | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | U.S. government and agency securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 371 431  
Fair value NAV 0 0  
SCE | U.S. government and agency securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 322 398  
SCE | U.S. government and agency securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 49 33  
SCE | U.S. government and agency securities | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Corporate stocks      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 204 254  
Fair value NAV 0 0  
SCE | Corporate stocks | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 204 254  
SCE | Corporate stocks | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Corporate stocks | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Corporate notes and bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 832 845  
Fair value NAV 0 0  
SCE | Corporate notes and bonds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Corporate notes and bonds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 832 845  
SCE | Corporate notes and bonds | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Common/collective funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 495 569  
Fair value NAV 495 569  
SCE | Common/collective funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Common/collective funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Common/collective funds | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Partnerships      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 89 82  
Fair value NAV 89 82  
SCE | Partnerships | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Partnerships | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Partnerships | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Registered investment companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 38 37  
Fair value NAV 0 0  
SCE | Registered investment companies | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 38 37  
SCE | Registered investment companies | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Registered investment companies | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Interest bearing cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 22 42  
Fair value NAV 0 0  
SCE | Interest bearing cash | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 22 42  
SCE | Interest bearing cash | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Interest bearing cash | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
SCE | Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 104 89  
Fair value NAV 0 0  
SCE | Other | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 5 5  
SCE | Other | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 99 84  
SCE | Other | Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 0 $ 0