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Fair Value Measurements (Fair Value by Level) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets at fair value            
Nuclear decommissioning trusts $ 4,415   $ 4,242      
Southern California Edison            
Assets at fair value            
Nuclear decommissioning trusts $ 4,415 $ 4,381 $ 4,242 $ 4,376 $ 4,344 $ 4,331
Liabilities at fair value            
Percentage of equity investments located in the United States 69.00%   70.00%      
Collateralized mortgage obligations and other asset backed securities $ 80   $ 79      
Payables, net, related to investments 28   127      
Southern California Edison | Fair Value, Measurements, Recurring            
Assets at fair value            
Derivative contracts 38   74      
Other 36   33      
Nuclear decommissioning trusts 4,443   4,369      
Total assets 4,517   4,476      
Liabilities at fair value            
Derivative contracts 3   1,157      
Netting and Collateral 0   0      
Total liabilities 3   1,157      
Net assets 4,514   3,319      
Southern California Edison | Fair Value, Measurements, Recurring | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 1,655   1,547      
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 2,645   2,616      
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 143   206      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1            
Assets at fair value            
Derivative contracts 0   0      
Other 36   33      
Nuclear decommissioning trusts 2,746   2,448      
Total assets 2,782   2,481      
Liabilities at fair value            
Derivative contracts 0   0      
Total liabilities 0   0      
Net assets 2,782   2,481      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 1,655   1,547      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 1,057   865      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 34   36      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2            
Assets at fair value            
Derivative contracts 14   6      
Other 0   0      
Nuclear decommissioning trusts 1,697   1,921      
Total assets 1,711   1,927      
Liabilities at fair value            
Derivative contracts 1   0      
Total liabilities 1   0      
Net assets 1,710   1,927      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 0   0      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 1,588   1,751      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 109   170      
Southern California Edison | Fair Value, Measurements, Recurring | Level 3            
Assets at fair value            
Derivative contracts 24   68      
Other 0   0      
Nuclear decommissioning trusts 0   0      
Total assets 24   68      
Liabilities at fair value            
Derivative contracts 2   1,157      
Total liabilities 2   1,157      
Net assets 22   (1,089)      
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 0   0      
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 0   0      
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts $ 0   $ 0