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INVESTMENTS IN UNCONSOLIDATED ENTITIES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Nov. 02, 2018
Apr. 23, 2018
Mar. 09, 2018
Sep. 30, 2018
Sep. 30, 2018
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]                    
Goodwill       $ 2,363 $ 2,363   $ 2,363 $ 2,363   $ 2,397 [1]
Equity earnings         153   281      
Equitization of note receivable due from unconsolidated affiliate               0 $ 19 [2]  
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures       12,114 12,114   12,114 12,114   2,527
Equity method investment       9,553 9,553   9,553 9,553   0 [1]
Maximum exposure under guarantor obligations       4,500 4,500   4,500 4,500    
Aggregate carrying value of guarantor obligations       20 20   20 20    
R B S Sempra Commodities [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Other than temporary impairment recognized       65            
Joint Venture [Member] | Sempra South American Utilities [Member] | Eletrans [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Investments made during period                 1  
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               45 72  
Joint Venture [Member] | Sempra LNG & Midstream [Member] | Cameron LNG [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Investments made during period               149 1  
Capitalized interest               34 $ 36  
Oncor Holdings [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Equity earnings         191   351      
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         154   283      
Investments made during period   $ 117                
Oncor Electric Delivery Company LLC. [Member] | Subsequent Event [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Investments made during period $ 112                  
Wind Investments [Member] | Sempra Renewables [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Other than temporary impairment recognized               200    
Operating Segments [Member] | Sempra LNG & Midstream [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures       1,252 1,252   1,252 1,252   $ 997
Operating Segments [Member] | Wind and Solar Investments [Member] | Sempra Renewables [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures       $ 600 $ 600   $ 600 $ 600    
[1] Derived from audited financial statements.
[2] As adjusted for the retrospective adoption of ASU 2016-15 and ASU 2016-18, which we discuss in Note 2.