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ACQUISTION AND DIVESTITURE ACTIVITY - PRO FORMA INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Revenues $ 10,463 $ 10,473    
Net income 1,145 1,938    
Earnings $ 1,058 $ 1,641    
IEnova [Member] | Sempra Mexico [Member]        
Business Acquisition [Line Items]        
Ownership percentage held by noncontrolling owners 33.60% 18.90% 33.60% 18.90%