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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Total $ 12,658 $ 14,386
Brazilian Regulated Gas Transmission Operation    
Disclosure of information for cash-generating units [line items]    
Total 2,805 3,885
North American Rail Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,999 1,992
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,729 1,758
North American Residential Energy Infrastructure Operation    
Disclosure of information for cash-generating units [line items]    
Total 1,696 1,806
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,088 1,159
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 729 814
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 705 769
U.K. Telecom Towers Operation    
Disclosure of information for cash-generating units [line items]    
Total 440 472
U.K. port operation    
Disclosure of information for cash-generating units [line items]    
Total 265 283
Brazil electricity transmission operation [Member]    
Disclosure of information for cash-generating units [line items]    
Total 252 401
Other    
Disclosure of information for cash-generating units [line items]    
Total 950 $ 1,047
Simhapuri Expressway Ltd and Rayalseema Expressway Ltd    
Disclosure of information for cash-generating units [line items]    
Total 628  
BIF India Holdings Pte Ltd    
Disclosure of information for cash-generating units [line items]    
Total $ 77