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SUBSEQUENT EVENT (Details) - USD ($)
$ / shares in Units, $ in Millions
Apr. 04, 2021
Jun. 30, 2021
Mar. 31, 2021
IEnova [Member]      
Subsequent Event [Line Items]      
Ownership interest (as a percent)     70.20%
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Proceeds from sale of interests $ 3,370.0    
Limited Partnership distributions (as a percent) 85.00%    
Subsequent Event [Member] | Sempra Global | KKR [Member]      
Subsequent Event [Line Items]      
Percent ownership held by noncontrolling interests 20.00%    
Subsequent Event [Member] | SIP      
Subsequent Event [Line Items]      
Ownership percentage of Limited Partnership Agreement 80.00%    
Subsequent Event [Member] | KKR [Member]      
Subsequent Event [Line Items]      
Indirect interest, price per ordinary share (in dollars per share) $ 4.13    
Reverse termination fee to be received $ 134.8    
Expenses paid in connection with transaction 150.0    
Disbursements to be paid $ 300.0    
Repayment of disbursements, rate (as a percent) 5.00%    
Forecast [Member]      
Subsequent Event [Line Items]      
Direct and indirect net debt at closing   $ 8,370.0