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ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - DIVESTITURES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 07, 2019
Jan. 31, 2019
Business Acquisition [Line Items]                
Gain on sale of assets     $ (3) $ 0 $ 63 $ 0    
Disposal Group Held-for-sale [Member]                
Business Acquisition [Line Items]                
Impairment charges   $ 1,500            
Impairment charges net of taxes and noncontrolling interests   900            
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Mississippi Hub And Bay Gas [Member] | Sempra LNG [Member]                
Business Acquisition [Line Items]                
Consideration to be received             $ 322  
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Non-Utility assets [Member] | Sempra LNG [Member]                
Business Acquisition [Line Items]                
Consideration to be received               $ 5
Sempra LNG [Member] | Disposal Group Held-for-sale [Member]                
Business Acquisition [Line Items]                
Impairment charges   1,300            
Impairment charges net of taxes and noncontrolling interests   755            
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member]                
Business Acquisition [Line Items]                
Impairment charges   200            
Impairment charges net of taxes and noncontrolling interests   $ 145            
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind Facilities [Member]                
Business Acquisition [Line Items]                
Consideration to be received $ 569              
Gain on sale of assets 61              
Gain on sale of assets after tax and NCI $ 45