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Investments (Textual) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Other Investments [Line Items]          
Proceeds from sale of securities     $ 7,253 $ 3,750  
Southern California Edison          
Other Investments [Line Items]          
Proceeds from sale of securities $ 4,400 $ 2,200 7,253 $ 3,750  
Unrealized holding gains, net of losses 1,800   1,800   $ 1,800
Deferred income taxes related to unrealized gains 427   427    
Nuclear decommissioning trusts $ 4,400   $ 4,400