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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of information for cash-generating units [line items]    
Total $ 12,406 $ 11,767
Brazilian Regulated Gas Transmission Operation    
Disclosure of information for cash-generating units [line items]    
Total 2,949 2,903
North American Rail Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,906 1,929
North American Residential Energy Infrastructure Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,759 1,748
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,011 1,073
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 781 825
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 679 714
Brazil electricity transmission operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 803 270
Indian Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 796 537
U.K. Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 494 491
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 296 292
Other    
Disclosure of information for cash-generating units [line items]    
Total 932 $ 985
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd    
Disclosure of information for cash-generating units [line items]    
Total 614  
BIF India Holdings Pte Ltd    
Disclosure of information for cash-generating units [line items]    
Total $ 65