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ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - ACQUISITION ACTIVITY (Details)
$ in Millions
Mar. 19, 2021
USD ($)
MW
Mar. 18, 2021
Dec. 31, 2020
Saavi Energia [Member] | ESJ [Member]      
Business Acquisition [Line Items]      
Ownership percentage 50.00%    
IEnova [Member] | Saavi Energia Asset Acquisition [Member] | Sempra Mexico [Member]      
Business Acquisition [Line Items]      
Purchase price $ 65    
Cash acquired 14    
Debt assumed 277    
Related party note payable assumed $ 94    
Subsequent acquisition, percentage 100.00%    
Equity interest in acquiree, fair value $ 34    
Assets acquired 458    
Liabilities assumed $ 345    
Power generation facility, nameplate capacity (in MW) | MW 155    
Intangible assets acquired $ 190    
Intangible assets acquired, useful life 14 years    
Second power generation facility, nameplate capacity (in MW) | MW 108    
IEnova [Member] | ESJ [Member] | Sempra Mexico [Member]      
Business Acquisition [Line Items]      
Ownership percentage   50.00% 50.00%