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PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT - Cost Model (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Utilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost $ 8,114 $ 7,776
Transport    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost 7,548 7,574
Midstream    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost 4,007 3,797
Data    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost $ 8,330 $ 1,043