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Supplemental Cash Flows Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Cash payments for interest and taxes:      
Interest, net of amounts capitalized $ 417 $ 434  
Tax payments, net 12 3  
Details of debt exchange:      
Pollution-control bonds redeemed (2.875%) 0 (203)  
Pollution-control bonds issued (1.875%) 0 203  
Common stock      
Dividends declared but not paid:      
Dividends declared but not paid 156 136  
Preferred and preference stock      
Dividends declared but not paid:      
Dividends declared but not paid 1 0  
Southern California Edison      
Cash payments for interest and taxes:      
Interest, net of amounts capitalized 408 409  
Tax payments, net 35 125  
Details of debt exchange:      
Pollution-control bonds redeemed (2.875%) 0 (203)  
Pollution-control bonds issued (1.875%) 0 203  
Accrued capital expenditures 268 403  
Reduction in lease obligation     $ 147
Southern California Edison | Common stock      
Dividends declared but not paid:      
Dividends declared but not paid 0 147  
Southern California Edison | Preferred and preference stock      
Dividends declared but not paid:      
Dividends declared but not paid $ 1 $ 0  
2.875% Pollution-Control Bonds      
Details of debt exchange:      
Interest rate on converted debt 2.875% 2.875%  
2.875% Pollution-Control Bonds | Southern California Edison      
Details of debt exchange:      
Interest rate on converted debt 2.875% 2.875%  
1.875% Pollution-Control Bonds Due in 2029      
Details of debt exchange:      
Interest rate on converted debt 1.875% 1.875%  
1.875% Pollution-Control Bonds Due in 2029 | Southern California Edison      
Details of debt exchange:      
Interest rate on converted debt 1.875% 1.875%