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ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - DIVESTITURES (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 30, 2019
Feb. 07, 2019
Jan. 31, 2019
Business Acquisition [Line Items]              
(Loss) gain on sale of assets $ 0 $ (3) $ 0 $ 63      
Sempra Renewables [Member] | Disposal Group Held-for-sale [Member] | Wind Facilities [Member]              
Business Acquisition [Line Items]              
Consideration to be received         $ 569    
(Loss) gain on sale of assets       61      
Gain on sale of assets, after tax and NCI       $ 45      
Sempra LNG [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Mississippi Hub And Bay Gas [Member]              
Business Acquisition [Line Items]              
Consideration to be received           $ 322  
Sempra LNG [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Non-Utility assets [Member]              
Business Acquisition [Line Items]              
Consideration to be received             $ 5