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INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Segment Information (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 5,127 $ 5,528 $ 4,967
Utilities      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 249 253  
Transport      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 2,754 2,759  
Data Infrastructure      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 1,087 1,133  
Corporate      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 15 11  
Midstream      
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 1,022 $ 1,372