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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of information for cash-generating units [line items]    
Total $ 13,524 $ 14,214
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 2,812 2,645
Canadian diversified midstream operation    
Disclosure of information for cash-generating units [line items]    
Total 2,395 2,536
North American Rail Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,799 1,867
North American Residential Energy Infrastructure Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,662 1,720
Brazil electricity transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 1,477 1,366
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,025 976
Indian Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 729 782
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 0 658
U.K. Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 429 480
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 260 289
Other    
Disclosure of information for cash-generating units [line items]    
Total $ 936 $ 895