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QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 22, 2019
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2020
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 24, 2020
Significant Items Affecting Quarterly Results [Line Items]                      
(Loss) gain on sale of assets               $ (3) $ 63 $ 513  
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
After tax gain on sale               $ 2,899 $ 0 $ 0  
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member] | Luz Del Sur [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Proceeds from sale         $ 3,549           $ 3,549
Pretax gain on sale         2,271            
After tax gain on sale         $ 1,499            
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member] | Chilquinta Energia [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Proceeds from sale       $ 2,216              
Pretax gain on sale       628              
After tax gain on sale       $ 248              
Disposal Group Held-for-sale [Member] | Wind Generation Projects [Member] | Sempra Renewables [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Proceeds from sale $ 569                    
(Loss) gain on sale of assets 61           $ 61        
Gain on sale of assets, after tax $ 45           $ 45        
Aliso Canyon Litigation and Regulatory Matters [Member] | Southern California Gas Company [Member]                      
Significant Items Affecting Quarterly Results [Line Items]                      
Charge for settlement   $ 180 $ 27     $ 100          
Litigation fines, after tax   $ 139 $ 22     $ 72