XML 72 R57.htm IDEA: XBRL DOCUMENT v3.19.2
INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Segment Information (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 4,623 $ 4,591 $ 5,572
Utilities      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 111 92  
Transport      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 2,382 2,497  
Energy      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 1,178 1,183  
Data Infrastructure      
Disclosure of operating segments [line items]      
Investments accounted for using equity method 923 710  
Corporate      
Disclosure of operating segments [line items]      
Investments accounted for using equity method $ 29 $ 109