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GOODWILL GOODWILL (Cash Generating Units) (Details) - Goodwill - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [line items]      
Goodwill $ 6,553 $ 3,859 $ 1,301
North American rail operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 2,042 0  
North American residential energy infrastructure operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 1,274 1,209  
Western Canadian natural gas gathering and processing operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 749 492  
Brazilian regulated gas transmission operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 632 657  
Colombian natural gas distribution operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 542 547  
U.S. data center operation      
Disclosure of information for cash-generating units [line items]      
Goodwill 486 463  
Other      
Disclosure of information for cash-generating units [line items]      
Goodwill $ 828 $ 491