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QUARTERLY FINANCIAL DATA (UNAUDITED) - NARRATIVE (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Sep. 30, 2018
Significant Items Affecting Quarterly Results [Line Items]                      
Gain on sale of assets $ 513,000,000             $ 524,000,000 $ 3,000,000 [1] $ 134,000,000  
Gain on sale of assets, net of tax 367,000,000                    
Total increase in income tax expense due to tax cuts and jobs act     $ 870,000,000         85,000,000 870,000,000    
Write-off of wildfire regulatory asset               0 351,000,000 [1] 0  
San Diego Gas and Electric Company [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Total increase in income tax expense due to tax cuts and jobs act               0 28,000,000    
Write-off of wildfire regulatory asset               0 351,000,000 [1] $ 0  
Termoelectrica de Mexicali [Member] | Sempra Mexico [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Other than temporary impairment in investment         $ 71,000,000 $ 71,000,000 $ 131,000,000        
Other than temporary impairment in investment, net of tax and noncontrolling interest         $ 47,000,000            
Loss from Catastrophes [Member] | San Diego Gas and Electric Company [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Write-off of wildfire regulatory asset       $ 351,000,000         351,000,000    
Write-off of wildfire regulatory asset net of tax       $ 208,000,000         $ 208,000,000    
Disposal Group Held-for-sale [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Asset impairment charges   $ (1,500,000,000)                  
Asset impairment charges, net of taxes and noncontrolling interests   (900,000,000)                  
Disposal Group Held-for-sale [Member] | Sempra LNG & Midstream [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Asset impairment charges 183,000,000 (1,300,000,000)           (1,100,000,000)      
Asset impairment charges, net of taxes and noncontrolling interests $ 126,000,000 (755,000,000)           $ (629,000,000)      
Disposal Group Held-for-sale [Member] | Sempra Renewables [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Asset impairment charges   (200,000,000)                  
Asset impairment charges, net of taxes and noncontrolling interests   $ (145,000,000)                  
R B S Sempra Commodities [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Investment in RBS Sempra Commodities                     $ 65,000,000
[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.