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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Total $ 11,767 $ 14,386
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 2,903 3,885
North American rail operation    
Disclosure of information for cash-generating units [line items]    
Total 1,929 1,992
North American residential energy infrastructure operation    
Disclosure of information for cash-generating units [line items]    
Total 1,748 1,806
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,073 1,159
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 825 814
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 714 769
Indian telecom towers operation    
Disclosure of information for cash-generating units [line items]    
Total 537 0
U.K. telecom towers operation    
Disclosure of information for cash-generating units [line items]    
Total 491 472
U.K. ports operation    
Disclosure of information for cash-generating units [line items]    
Total 292 283
Brazilian electricity transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 270 401
Other    
Disclosure of information for cash-generating units [line items]    
Total 985 1,047
Australian export terminal    
Disclosure of information for cash-generating units [line items]    
Total 0 $ 1,758
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd    
Disclosure of information for cash-generating units [line items]    
Total 641  
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total $ 73