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INTANGIBLE ASSETS - Cash Generating Units (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]    
Total $ 14,386 $ 11,635
Brazilian regulated gas transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 3,885 4,211
North American rail operation    
Disclosure of information for cash-generating units [line items]    
Total 1,992  
North American residential energy infrastructure operation    
Disclosure of information for cash-generating units [line items]    
Total 1,806 1,763
Australian regulated terminal    
Disclosure of information for cash-generating units [line items]    
Total 1,758 1,766
Peruvian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 1,159 1,118
Chilean toll roads    
Disclosure of information for cash-generating units [line items]    
Total 814 928
Indian toll roads    
Disclosure of information for cash-generating units [line items]    
Total 769 843
U.K. telecom towers operation    
Disclosure of information for cash-generating units [line items]    
Total 472  
Brazilian electricity transmission operation    
Disclosure of information for cash-generating units [line items]    
Total 401 0
U.K. ports operation    
Disclosure of information for cash-generating units [line items]    
Total 283 273
Other    
Disclosure of information for cash-generating units [line items]    
Total $ 1,047 $ 733