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ISSUED CAPITAL AND RESERVES (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 15, 2016
ISSUED CAPITAL AND RESERVES        
Treasury shares (7,603,731)      
Other comprehensive loss, net of tax, exchange differences on translation $ 638 $ (85) $ 1,836  
Common shares        
ISSUED CAPITAL AND RESERVES        
Nominal value per share $ 0.001 $ 0.001    
Authorized common shares (nominal value of US$0.001 per share) 2,759,171,830 2,759,171,830    
Issued shares (see Note 1) 1,756,731,135 1,756,731,135    
Treasury shares (7,603,731) (7,726,487)    
Outstanding shares 1,749,127,404 1,749,004,648    
Convertible preferred shares        
ISSUED CAPITAL AND RESERVES        
Nominal value per share $ 0.001 $ 0.001    
Authorized common shares (nominal value of US$0.001 per share) 0 0    
Outstanding shares 0 0    
Preferred shares        
ISSUED CAPITAL AND RESERVES        
Outstanding shares       0
Number of shares redeemed       305,000,000
Redemption price per share       $ 0.001
Foreign exchange contracts | Net investment hedge accounting        
ISSUED CAPITAL AND RESERVES        
Other comprehensive loss, net of tax, exchange differences on translation $ 125