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GOODWILL - Cash Generating Units (Details) - Goodwill - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]      
Goodwill $ 8,979 $ 6,634 $ 6,553
Canadian diversified midstream operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 2,125 0  
North American rail operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 2,105 2,126  
North American residential energy infrastructure operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 1,356 1,296  
Western Canadian natural gas gathering and processing operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 762 756  
Colombian natural gas distribution operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 433 520  
Brazilian regulated gas transmission operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 456 490  
U.S. data center operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 503 487  
U.K. telecom towers operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 341 345  
Other      
Disclosure of information for cash-generating units [line items]      
Goodwill $ 898 $ 614