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GENERAL INFORMATION AND OTHER FINANCIAL DATA - DUE TO DUE FROM AFFILIATES (Details)
$ in Billions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
MXN ($)
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current $ 43,000,000 $ 37,000,000 [1]  
Due from unconsolidated affiliates - noncurrent 682,000,000 598,000,000 [1]  
Due to unconsolidated affiliates, current (7,000,000) (7,000,000) [1]  
Due to unconsolidated affiliates - noncurrent $ (36,000,000) (35,000,000) [1]  
ESJ joint venture [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate 637.50%    
Interest rate on due from affiliate, noncurrent 8.63%    
TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Interest rate on due from affiliate, noncurrent 5.50%    
TAG Pipeline Norte [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate 290.00%    
San Diego Gas and Electric Company [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current $ 1,000,000 0 [1]  
Due to unconsolidated affiliates, current (303,000,000) (40,000,000) [1]  
Maximum borrowing capacity 750,000,000    
San Diego Gas and Electric Company [Member] | Due to/from Other affiliates [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (8,000,000) (6,000,000)  
San Diego Gas and Electric Company [Member] | Due to/from Sempra Energy [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (45,000,000) (30,000,000)  
Income taxes due (to) from Sempra Energy 44,000,000 27,000,000  
San Diego Gas and Electric Company [Member] | Due to/from SoCalGas [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 1,000,000 0  
Due to unconsolidated affiliates, current 0 (4,000,000)  
San Diego Gas and Electric Company [Member] | Enova Corporation [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (250,000,000) 0  
Southern California Gas Company [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 49,000,000 4,000,000 [1]  
Due to unconsolidated affiliates, current (51,000,000) (35,000,000) [1]  
Maximum borrowing capacity 750,000,000    
Southern California Gas Company [Member] | Due to/from SDG&E      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 0 4,000,000  
Due to unconsolidated affiliates, current (1,000,000) 0  
Southern California Gas Company [Member] | Due to/from Sempra Energy [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 49,000,000 0  
Due to unconsolidated affiliates, current 0 (35,000,000)  
Income taxes due (to) from Sempra Energy $ 3,000,000 10,000,000  
Interest rate on due from affiliate, noncurrent 2.35%    
Outstanding advances $ 88,000,000    
Southern California Gas Company [Member] | Pacific Enterprises [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (50,000,000) 0  
Sempra South American Utilities [Member] | Eletrans [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - noncurrent $ 40,000,000 103,000,000  
Interest rate on due from affiliate, noncurrent 4.00%    
Sempra South American Utilities [Member] | Due to/from Other affiliates [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - noncurrent $ 1,000,000 1,000,000  
Sempra Mexico [Member] | IMG [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - noncurrent 638,000,000 487,000,000  
Maximum borrowing capacity $ 757,000,000   $ 14.2
Sempra Mexico [Member] | IMG [Member] | Interbank Equilibrium Rate [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate 220.00%    
Interest rate on due from affiliate, noncurrent 10.37%    
Sempra Mexico [Member] | ESJ joint venture [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - noncurrent $ 3,000,000 7,000,000  
Sempra Mexico [Member] | TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent $ (36,000,000) $ (35,000,000)  
[1] Derived from audited financial statements.