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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
May 31, 2016
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]          
Equitization of note receivable due from unconsolidated affiliate   $ 19 $ 0 [1]    
Maximum exposure under guarantor obligations   4,700      
Aggregate carrying value of guarantor obligations   44      
Sempra LNG & Midstream [Member] | Rockies Express [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage sold       25.00% 25.00%
Joint Venture [Member] | Sempra South American Utilities [Member] | Eletrans [Member]          
Schedule of Equity Method Investments [Line Items]          
Equitization of note receivable due from unconsolidated affiliate $ 19        
Joint Venture [Member] | Sempra Mexico [Member] | IMG [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments made during period   72      
Joint Venture [Member] | Sempra Renewables [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments made during period     18    
Joint Venture [Member] | Sempra LNG & Midstream [Member] | Cameron LNG [Member]          
Schedule of Equity Method Investments [Line Items]          
Investments made during period   1      
Capitalized interest   24 $ 24    
Infraestructura Energética Nova [Member] | Joint Venture [Member] | Sempra Mexico [Member] | IMG [Member]          
Schedule of Equity Method Investments [Line Items]          
Maximum exposure under guarantor obligations   $ 288      
Percent ownership held by noncontrolling interests   40.00%      
TransCanada [Member] | Infraestructura Energética Nova [Member] | Joint Venture [Member] | Sempra Mexico [Member] | IMG [Member]          
Schedule of Equity Method Investments [Line Items]          
Percent ownership held by noncontrolling interests   60.00%      
[1] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.