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TRADE AND OTHER RECEIVABLES - Movements in the allowance for doubtful debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
TRADE AND OTHER RECEIVABLES    
Balance as at January 1 $ 160 $ 182
Acquisition of a subsidiary   9
Divestment of a subsidiary   (57)
Classified as held for sale (1)  
Allowance for doubtful debts 36 73
Recoveries (9) (5)
Accounts receivable written off (13) (44)
Foreign currency translation adjustment (4) 2
Balance as at December 31 $ 169 $ 160