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ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Sempra South American Utilities (Details) - USD ($)
$ in Millions
Dec. 18, 2018
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 1,602 $ 1,602
Compania Transmisora del Norte Grande S.A. [Member]      
Business Acquisition [Line Items]      
Total purchase price paid $ 226    
Cash consideration (fair value of total consideration) 208    
Cash and cash equivalents 18    
Identifiable assets acquired 231    
Liabilities assumed 43    
Goodwill $ 38    
Compania Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member] | Compania Transmisora del Norte Grande S.A. [Member]      
Business Acquisition [Line Items]      
Acquired percentage interest 100.00%