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ACQUISTION AND DIVESTITURE ACTIVITY - PRO FORMA INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
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%   33.60% 33.60% 18.90%