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GENERAL INFORMATION AND OTHER FINANCIAL DATA - DUE TO DUE FROM AFFILIATES (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
MXN ($)
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current $ 91,000,000 $ 32,000,000 [1]  
Due from unconsolidated affiliates - noncurrent 603,000,000 742,000,000 [1]  
Due to unconsolidated affiliates, current (9,000,000) (5,000,000) [1]  
Due to unconsolidated affiliates - noncurrent $ (267,000,000) $ (195,000,000) [1]  
TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Interest rate on due from affiliate, noncurrent 3.27%    
TAG Pipeline Norte [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate (as a percent) 2.90% 2.90%  
ESJ joint venture [Member]      
Related Party Transaction [Line Items]      
Note receivable, term 10 years    
ESJ joint venture [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate (as a percent) 1.96%    
Interest rate on due from affiliate, noncurrent 2.13%    
San Diego Gas and Electric Company [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current $ (173,000,000) $ (53,000,000) [1]  
Maximum borrowing capacity 1,500,000,000    
San Diego Gas and Electric Company [Member] | Due to/from Sempra Energy [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (164,000,000) (37,000,000)  
Income taxes due (to) from Sempra Energy 31,000,000 130,000,000  
San Diego Gas and Electric Company [Member] | Due to/from SoCalGas [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current 0 (10,000,000)  
San Diego Gas and Electric Company [Member] | Due to/from Other affiliates [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (9,000,000) (6,000,000)  
Southern California Gas Company [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 1,000,000 11,000,000 [1]  
Due to unconsolidated affiliates, current (135,000,000) (47,000,000) [1]  
Maximum borrowing capacity 750,000,000    
Southern California Gas Company [Member] | Due to/from Sempra Energy [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (85,000,000) (45,000,000)  
Income taxes due (to) from Sempra Energy 34,000,000 152,000,000  
Southern California Gas Company [Member] | Due to/from Other affiliates [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 1,000,000 1,000,000  
Due to unconsolidated affiliates, current 0 (2,000,000)  
Southern California Gas Company [Member] | Due to/from SDG&E      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 0 10,000,000  
Southern California Gas Company [Member] | Pacific Enterprises [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (50,000,000) 0  
IEnova Pipelines [Member] | ESJ joint venture [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 25,000,000    
Sempra Mexico [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent (267,000,000) (195,000,000)  
Sempra Mexico [Member] | IMG [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - noncurrent 603,000,000 $ 742,000,000  
Due from affiliates, allowance for credit loss 3,000,000    
Maximum borrowing capacity 614,000,000   $ 14,200,000,000
Accrued interest receivable $ 2,000,000    
Sempra Mexico [Member] | IMG [Member] | Interbank Equilibrium Rate [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate (as a percent) 2.20% 2.20%  
Interest rate on due from affiliate, noncurrent 7.44%    
Sempra Mexico [Member] | TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Stated rate of debt (as a percent) 5.50%   5.50%
Sempra Mexico [Member] | TAG JV Notes [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent $ (161,000,000) $ (156,000,000)  
Stated rate of debt (as a percent) 5.74%   5.74%
Other Long term Debt Currently Through December 2021 [Member] | Sempra Mexico [Member] | TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent $ (40,000,000) (39,000,000)  
Other Long term Debt Currently Through January 2024 [Member] | Sempra Mexico [Member] | TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent $ (66,000,000) $ 0  
[1]
Derived from audited financial statements.