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Fair Value Measurements (Fair Value by Level) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets at fair value            
Nuclear decommissioning trusts $ 4,381   $ 4,242      
Southern California Edison            
Assets at fair value            
Nuclear decommissioning trusts $ 4,381 $ 4,352 $ 4,242 $ 4,344 $ 4,290 $ 4,331
Liabilities at fair value            
Percentage of equity investments located in the United States 68.00%   70.00%      
Collateralized mortgage obligations and other asset backed securities $ 74   $ 79      
Payables, net, related to investments 68   127      
Southern California Edison | Fair Value, Measurements, Recurring            
Assets at fair value            
Derivative contracts 59   74      
Other 29   33      
Nuclear decommissioning trusts 4,449   4,369      
Total assets 4,537   4,476      
Liabilities at fair value            
Derivative contracts 1,058   1,157      
Netting and Collateral 0   0      
Total liabilities 1,058   1,157      
Net assets (liabilities) 3,479   3,319      
Southern California Edison | Fair Value, Measurements, Recurring | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 1,611   1,547      
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 2,608   2,616      
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 230   206      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1            
Assets at fair value            
Derivative contracts 0   0      
Other 29   33      
Nuclear decommissioning trusts 2,771   2,448      
Total assets 2,800   2,481      
Liabilities at fair value            
Derivative contracts 0   0      
Total liabilities 0   0      
Net assets (liabilities) 2,800   2,481      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks            
Assets at fair value            
Nuclear decommissioning trusts 1,611   1,547      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income            
Assets at fair value            
Nuclear decommissioning trusts 1,049   865      
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 111   36      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2            
Assets at fair value            
Derivative contracts 23   6      
Other 0   0      
Nuclear decommissioning trusts 1,678   1,921      
Total assets 1,701   1,927      
Liabilities at fair value            
Derivative contracts 10   0      
Total liabilities 10   0      
Net assets (liabilities) 1,691   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 1,559   1,751      
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents            
Assets at fair value            
Nuclear decommissioning trusts 119   170      
Southern California Edison | Fair Value, Measurements, Recurring | Level 3            
Assets at fair value            
Derivative contracts 36   68      
Other 0   0      
Nuclear decommissioning trusts 0   0      
Total assets 36   68      
Liabilities at fair value            
Derivative contracts 1,048   1,157      
Total liabilities 1,048   1,157      
Net assets (liabilities) (1,012)   (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