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REVENUES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenue $ 3,535 $ 2,115 $ 1,855
Utilities | Regulated Transmission      
Disclosure of operating segments [line items]      
Revenue 938 27 43
Utilities | Regulated Terminal      
Disclosure of operating segments [line items]      
Revenue 301 299 330
Utilities | Regulated Distribution      
Disclosure of operating segments [line items]      
Revenue 546 499 491
Transport | Rail      
Disclosure of operating segments [line items]      
Revenue 296 270 316
Transport | Ports      
Disclosure of operating segments [line items]      
Revenue 681 360 220
Transport | Toll Roads      
Disclosure of operating segments [line items]      
Revenue 313 262 113
Energy | Transmission & Storage      
Disclosure of operating segments [line items]      
Revenue 150 141 105
Energy | District Energy      
Disclosure of operating segments [line items]      
Revenue $ 310 $ 257 $ 237