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COMMITMENTS AND CONTINGENCIES - LEASE INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lessee, Lease, Description [Line Items]        
Fixed lease payments $ 59 $ 47 $ 112 $ 97
Variable lease payments 1 0 1 0
Operating Lease, Lease Income 60 47 113 97
Depreciation expense $ 12 $ 9 22 $ 19
San Diego Gas and Electric Company [Member]        
Lessee, Lease, Description [Line Items]        
Lease not yet commenced, 2021     3  
Lease not yet commenced, 2022     10  
Lease not yet commenced, 2023     10  
Lease not yet commenced, 2024     10  
Lease not yet commenced, 2025     10  
Lease not yet commenced, thereafter     $ 101