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Fair Value Measurements (Fair Value by Level) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets at fair value        
Nuclear decommissioning trusts $ 4,242 $ 4,331    
SCE        
Assets at fair value        
Nuclear decommissioning trusts $ 4,242 $ 4,331 $ 4,799 $ 4,494
Liabilities at fair value        
Percentage of equity investments located in the United States (as a percent) 70.00% 70.00%    
Collateralized mortgage obligations and other asset backed securities $ 79 $ 111    
Payables, net, related to investments (127) (24)    
SCE | Fair Value, Measurements, Recurring        
Assets at fair value        
Derivative contracts 74 163    
Other 33 28    
Nuclear decommissioning trusts 4,369 4,355    
Total assets 4,476 4,546    
Liabilities at fair value        
Derivative contracts 1,157 1,318    
Netting and Collateral 0 15    
Total liabilities 1,157 1,318    
Net assets (liabilities) 3,319 3,228    
SCE | Fair Value, Measurements, Recurring | Stocks        
Assets at fair value        
Nuclear decommissioning trusts 1,547 1,460    
SCE | Fair Value, Measurements, Recurring | Fixed Income        
Assets at fair value        
Nuclear decommissioning trusts 2,616 2,723    
SCE | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents        
Assets at fair value        
Nuclear decommissioning trusts 206 172    
SCE | Fair Value, Measurements, Recurring | Level 1        
Assets at fair value        
Derivative contracts 0 0    
Other 33 28    
Nuclear decommissioning trusts 2,448 2,498    
Total assets 2,481 2,526    
Liabilities at fair value        
Derivative contracts 0 0    
Total liabilities 0 0    
Net assets (liabilities) 2,481 2,526    
SCE | Fair Value, Measurements, Recurring | Level 1 | Stocks        
Assets at fair value        
Nuclear decommissioning trusts 1,547 1,460    
SCE | Fair Value, Measurements, Recurring | Level 1 | Fixed Income        
Assets at fair value        
Nuclear decommissioning trusts 865 947    
SCE | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents        
Assets at fair value        
Nuclear decommissioning trusts 36 91    
SCE | Fair Value, Measurements, Recurring | Level 2        
Assets at fair value        
Derivative contracts 6 0    
Other 0 0    
Nuclear decommissioning trusts 1,921 1,857    
Total assets 1,927 1,857    
Liabilities at fair value        
Derivative contracts 0 22    
Total liabilities 0 22    
Net assets (liabilities) 1,927 1,835    
SCE | Fair Value, Measurements, Recurring | Level 2 | Stocks        
Assets at fair value        
Nuclear decommissioning trusts 0 0    
SCE | Fair Value, Measurements, Recurring | Level 2 | Fixed Income        
Assets at fair value        
Nuclear decommissioning trusts 1,751 1,776    
SCE | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents        
Assets at fair value        
Nuclear decommissioning trusts 170 81    
SCE | Fair Value, Measurements, Recurring | Level 3        
Assets at fair value        
Derivative contracts 68 163    
Other 0 0    
Nuclear decommissioning trusts 0 0    
Total assets 68 163    
Liabilities at fair value        
Derivative contracts 1,157 1,311    
Total liabilities 1,157 1,311    
Net assets (liabilities) (1,089) (1,148)    
SCE | Fair Value, Measurements, Recurring | Level 3 | Stocks        
Assets at fair value        
Nuclear decommissioning trusts 0 0    
SCE | Fair Value, Measurements, Recurring | Level 3 | Fixed Income        
Assets at fair value        
Nuclear decommissioning trusts 0 0    
SCE | Fair Value, Measurements, Recurring | Level 3 | Short-term investments, primarily cash equivalents        
Assets at fair value        
Nuclear decommissioning trusts $ 0 $ 0