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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details)
$ in Millions, MXN in Billions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
MXN
Nov. 15, 2017
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - current $ 37 $ 26 [1]    
Due from unconsolidated affiliates - noncurrent 598 201 [1]    
Due to unconsolidated affiliates, noncurrent (35) 0 [1]    
Due to unconsolidated affiliates - current $ (7) $ (11) [1]    
Joint venture with PEMEX [Member]        
Related Party Transaction [Line Items]        
Related party transaction rate   5.27%    
ESJ joint venture [Member]        
Related Party Transaction [Line Items]        
Related party transaction rate 7.94%      
TAG Pipeline Norte [Member]        
Related Party Transaction [Line Items]        
Related party transaction rate 4.74%      
LIBOR [Member] | Joint venture with PEMEX [Member]        
Related Party Transaction [Line Items]        
Variable percentage rate   450.00%    
LIBOR [Member] | ESJ joint venture [Member]        
Related Party Transaction [Line Items]        
Variable percentage rate 637.50%      
LIBOR [Member] | TAG Pipeline Norte [Member]        
Related Party Transaction [Line Items]        
Variable percentage rate 290.00%      
Sempra South American Utilities [Member] | Eletrans [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - noncurrent $ 103 $ 96    
Sempra South American Utilities [Member] | Other related parties [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - noncurrent 1 1    
Sempra Mexico [Member] | IMG [Member]        
Related Party Transaction [Line Items]        
Committed lines of credit, maximum borrowing capacity 718   MXN 14.0  
Due from unconsolidated affiliates - noncurrent 487 0    
Sempra Mexico [Member] | Joint venture with PEMEX [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - noncurrent 0 90    
Sempra Mexico [Member] | ESJ joint venture [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - noncurrent 7 14    
Sempra Mexico [Member] | TAG Pipeline Norte [Member]        
Related Party Transaction [Line Items]        
Due to unconsolidated affiliates, noncurrent $ (35) 0    
Sempra Mexico [Member] | Interbank Equilibrium Rate [Member] | IMG [Member]        
Related Party Transaction [Line Items]        
Variable percentage rate 220.00%      
Related party transaction rate 9.87%      
San Diego Gas and Electric Company [Member]        
Related Party Transaction [Line Items]        
Committed lines of credit, maximum borrowing capacity $ 750      
Due from unconsolidated affiliates - current 0 4 [1]    
Due to unconsolidated affiliates - current (40) (15) [1]    
San Diego Gas and Electric Company [Member] | Due to/from Sempra Energy [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - current 0 3    
Due to unconsolidated affiliates - current (30) 0    
Income taxes due from (to) Sempra Energy 27 $ 159    
Related party transaction rate   0.68%    
Loan to unconsolidated affiliate, principal   $ 31    
San Diego Gas and Electric Company [Member] | Due to/from Various Affiliates [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - current 0 1    
Due to unconsolidated affiliates - current (6) (7)    
San Diego Gas and Electric Company [Member] | Due to/from SoCalGas [Member]        
Related Party Transaction [Line Items]        
Due to unconsolidated affiliates - current (4) (8)    
Southern California Gas Company [Member]        
Related Party Transaction [Line Items]        
Committed lines of credit, maximum borrowing capacity 750      
Due from unconsolidated affiliates - current 4 8 [1]    
Due to unconsolidated affiliates - current (35) (28) [1]    
Southern California Gas Company [Member] | Due to/from Sempra Energy [Member]        
Related Party Transaction [Line Items]        
Due to unconsolidated affiliates - current (35) (28)    
Income taxes due from (to) Sempra Energy 10 5    
Southern California Gas Company [Member] | Due to/from SDGE [Member]        
Related Party Transaction [Line Items]        
Due from unconsolidated affiliates - current $ 4 $ 8    
Ductos Energéticos del Norte [Member] | IEnova [Member] | Sempra Mexico [Member]        
Related Party Transaction [Line Items]        
Acquired percentage interest       50.00%
[1] Reflects reclassifications to conform to current year presentation, which we discuss in Note 1.