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INVESTMENTS IN UNCONSOLIDATED ENTITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 4 Months Ended 6 Months Ended
Apr. 23, 2018
Mar. 09, 2018
Jun. 30, 2018
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
[1]
Schedule of Equity Method Investments [Line Items]                
Goodwill     $ 2,371   $ 2,371 $ 2,371   $ 2,397
Equity earnings     113   128      
Equitization of note receivable due from unconsolidated affiliate           0 $ 19 [2]  
Equity method investment     9,407   9,407 9,407   $ 0
Maximum exposure under guarantor obligations     4,500   4,500 4,500    
Aggregate carrying value of guarantor obligations     26   26 26    
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           25 72  
Joint Venture [Member] | Sempra LNG & Midstream [Member] | Cameron LNG [Member]                
Schedule of Equity Method Investments [Line Items]                
Investments made during period           102 1  
Capitalized interest           22 $ 24  
Oncor Holdings [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity earnings     141   160      
Oncor Electric Delivery Company LLC. [Member]                
Schedule of Equity Method Investments [Line Items]                
Acquired percentage interest   80.25%            
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member]                
Schedule of Equity Method Investments [Line Items]                
Consideration   $ 9,161            
Goodwill   $ 2,672            
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] | Sempra Texas Intermediate Holding Company LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage in consolidated entity   100.00%            
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC. [Member]                
Schedule of Equity Method Investments [Line Items]                
Acquired percentage interest   80.03%            
Sempra Texas Holdings Corp [Member] | Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member]                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage in consolidated entity   80.25%            
Oncor Electric Delivery Company LLC. [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity earnings     114   129      
Investments made during period $ 117              
Wind Investments [Member] | Sempra Renewables [Member]                
Schedule of Equity Method Investments [Line Items]                
Other than temporary impairment recognized     200          
Wind and Solar Investments [Member] | Sempra Renewables [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment     $ 612   $ 612 $ 612    
[1] Derived from audited financial statements.
[2] As adjusted for the retrospective adoption of ASU 2016-18, which we discuss in Note 2.