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Loans and Other Borrowings - Summary of Facilities Provided by Banks (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of facilities provided by banks [line items]    
Utilised facilities $ 0 $ 265
Unutilised facilities provided by banks 1,403 1,155
Total 1,403 1,420
Committed [member]    
Disclosure of facilities provided by banks [line items]    
Utilised facilities 0 264
Unutilised facilities provided by banks 1,350 1,086
Total 1,350 1,350
Uncommitted [member]    
Disclosure of facilities provided by banks [line items]    
Utilised facilities 0 1
Unutilised facilities provided by banks 53 69
Total $ 53 $ 70