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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 07, 2019
Feb. 28, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Noncontrolling Interest [Line Items]          
Stock repurchased in the period     $ 26 $ 21 $ 15
Sempra Mexico [Member] | IEnova [Member]          
Noncontrolling Interest [Line Items]          
Stock repurchased during the period (in shares)     2,620,000 2,000,000  
Stock repurchased in the period     $ 10 $ 7  
IEnova [Member] | Sempra Mexico [Member]          
Noncontrolling Interest [Line Items]          
Ownership interest     66.60% 66.50% 66.40%
IEnova [Member] | Sempra LNG [Member]          
Noncontrolling Interest [Line Items]          
Ownership interest     50.00%    
Bay Gas [Member] | Sempra LNG [Member]          
Noncontrolling Interest [Line Items]          
Ownership interest       9.10%  
Cash consideration (fair value of total consideration)   $ 20      
Bay Gas [Member] | Sempra LNG [Member]          
Noncontrolling Interest [Line Items]          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent, Percent 100.00%