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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of information for cash-generating units [line items]    
Total $ 14,214 $ 11,767
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 2,645 2,903
Canadian diversified midstream operation    
Disclosure of information for cash-generating units [line items]    
Total 2,536 0
North American rail operation    
Disclosure of information for cash-generating units [line items]    
Total 1,867 1,929
North American residential energy infrastructure operation    
Disclosure of information for cash-generating units [line items]    
Total 1,720 1,748
Brazil electricity transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 1,366 270
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 976 1,073
Indian Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 782 537
Indian Toll Roads    
Disclosure of information for cash-generating units [line items]    
Total 658 714
U.K. telecom towers operation    
Disclosure of information for cash-generating units [line items]    
Total 480 491
U.K. ports operation    
Disclosure of information for cash-generating units [line items]    
Total 289 292
Other    
Disclosure of information for cash-generating units [line items]    
Total 895 985
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 0 $ 825
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd    
Disclosure of information for cash-generating units [line items]    
Total 604  
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total $ 54