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PROPERTY, PLANT AND EQUIPMENT - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Utilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets $ 159 $ 156
Transport    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets 1,187 1,329
Midstream    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets 113 116
Data    
Disclosure of detailed information about property, plant and equipment [line items]    
Right-of-use assets 2,643 560
Accumulated fair value adjustments:    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation 786 719
Accumulated fair value adjustments: | Utilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation 652 582
Accumulated fair value adjustments: | Transport    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation 113 45
Accumulated fair value adjustments: | Midstream    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation 21 92
Accumulated fair value adjustments: | Data    
Disclosure of detailed information about property, plant and equipment [line items]    
Gain from revaluation $ 0 $ 0