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FINANCIAL ASSETS AND LIABILITIES - Financial assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
FINANCIAL ASSETS    
Total financial assets, at carrying value $ 99 $ 1,164
Financial assets, at fair value 99 1,164
Non-current 18 34
Current 81 1,130
Financial assets at fair value    
FINANCIAL ASSETS    
Total financial assets, at carrying value 59 81
Financial assets, at fair value 59 81
Loans granted, deposits and other financial assets    
FINANCIAL ASSETS    
Total financial assets, at carrying value 40 1,083
Financial assets, at fair value 40 1,083
Financial assets at fair value through profit or loss | Foreign exchange contracts    
FINANCIAL ASSETS    
Total financial assets, at carrying value 3 5
Financial assets, at fair value 3 5
Financial assets at fair value through profit or loss | Embedded derivatives in notes    
FINANCIAL ASSETS    
Total financial assets, at carrying value   5
Financial assets, at fair value   5
Financial assets at fair value through other comprehensive income | Financial assets at fair value    
FINANCIAL ASSETS    
Total financial assets, at carrying value 56  
Financial assets, at fair value 56  
Available for sale financial instruments | Available-for-sale financial instruments    
FINANCIAL ASSETS    
Total financial assets, at carrying value   71
Financial assets, at fair value   71
Financial assets at amortised cost | Bank deposits and interest accrued    
FINANCIAL ASSETS    
Total financial assets, at carrying value 15 70
Financial assets, at fair value 15 70
Financial assets at amortised cost | Cash pledged as collateral    
FINANCIAL ASSETS    
Total financial assets, at carrying value   998
Financial assets, at fair value   998
Financial assets at amortised cost | Other investment    
FINANCIAL ASSETS    
Total financial assets, at carrying value 20 12
Financial assets, at fair value 20 12
Financial assets at amortised cost | Other loans granted    
FINANCIAL ASSETS    
Total financial assets, at carrying value 5 3
Financial assets, at fair value $ 5 $ 3