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GENERAL INFORMATION AND OTHER FINANCIAL DATA - DUE TO DUE FROM AFFILIATES (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
MXN ($)
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current $ 64,000,000 $ 32,000,000 [1]  
Due from unconsolidated affiliates - noncurrent 592,000,000 742,000,000 [1]  
Due to unconsolidated affiliates, current (8,000,000) (5,000,000) [1]  
Due to unconsolidated affiliates - noncurrent (263,000,000) (195,000,000) [1]  
Sempra Texas Utilities - TTHC [Member]      
Related Party Transaction [Line Items]      
Due From Related Party, Noncurrent, Allowance For Credit Loss 1,000,000    
Due from unconsolidated affiliates - noncurrent $ 6,000,000 $ 0  
ESJ joint venture [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate 1.96%    
Interest rate on due from affiliate, noncurrent 3.54%    
TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Interest rate on due from affiliate, noncurrent 4.08%    
TAG Pipeline Norte [Member] | LIBOR [Member]      
Related Party Transaction [Line Items]      
Spread on variable rate 2.90% 2.90%  
IEnova Pipelines [Member]      
Related Party Transaction [Line Items]      
Note receivable, term 10 years    
San Diego Gas and Electric Company [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current $ (59,000,000) $ (53,000,000) [1]  
Maximum borrowing capacity 1,500,000,000    
San Diego Gas and Electric Company [Member] | Due to/from SoCalGas [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates, current (6,000,000) (10,000,000)  
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) (37,000,000)  
Income taxes due (to) from Sempra Energy 64,000,000 130,000,000  
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)  
Southern California Gas Company [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 7,000,000 11,000,000 [1]  
Due to unconsolidated affiliates, current (49,000,000) (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 (49,000,000) (45,000,000)  
Income taxes due (to) from Sempra Energy 104,000,000 152,000,000  
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 6,000,000 10,000,000  
IEnova Pipelines [Member] | ESJ joint venture [Member]      
Related Party Transaction [Line Items]      
Due from unconsolidated affiliates - current 23,000,000    
Sempra Mexico [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent 263,000,000 195,000,000  
Sempra Mexico [Member] | IMG [Member]      
Related Party Transaction [Line Items]      
Due From Related Party, Noncurrent, Allowance For Credit Loss 6,000,000    
Due from unconsolidated affiliates - noncurrent 586,000,000 $ 742,000,000  
Maximum borrowing capacity 604,000,000   $ 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 2.20% 2.20%  
Interest rate on due from affiliate, noncurrent 8.79%    
Sempra Mexico [Member] | TAG Pipeline Norte [Member]      
Related Party Transaction [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.50%   5.50%
Sempra Mexico [Member] | TAG JV Notes [Member]      
Related Party Transaction [Line Items]      
Due to unconsolidated affiliates - noncurrent $ (158,000,000) $ (156,000,000)  
Debt Instrument, Interest Rate, Stated Percentage 5.74%   5.74%
November 5, 2028 | Sempra Texas Utilities - TTHC [Member]      
Related Party Transaction [Line Items]      
Fixed interest rate (as a percent) 6.25%    
November 5, 2030 | Sempra Texas Utilities - TTHC [Member]      
Related Party Transaction [Line Items]      
Fixed interest rate (as a percent) 6.45%    
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 $ (65,000,000) $ 0  
[1]
Derived from audited financial statements.