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INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Segment Information (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 4,336 $ 4,967 $ 4,591
Utilities      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 211 245  
Transport      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 1,854 2,398  
Energy      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 1,290 1,267  
Data Infrastructure      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 949 1,029  
Corporate      
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 32 $ 28