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FINANCIAL ASSETS AND LIABILITIES - Reconciliation of movements relating to financial instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
The reconciliation of movements relating to financial instruments      
Beginning Balance, assets $ 496    
Currency translation adjustments   $ 259  
Impairment Loss (66) (192) $ (245)
Ending Balance, assets 1,164 496  
Beginning balance, liabilities 11,116    
Ending balance, liabilities 11,630 11,116  
Transfers of financial assets from level 1 to 2 0 0  
Transfers of financial assets from level 2 to 1 0 0  
Transfers of financial assets into 3 0 0  
Transfers of financial assets from 3 0 0  
Transfers of financial liabilities from level 1 to 2 0 0  
Transfers of financial liabilities from level 2 to 1 0 0  
Transfers of financial liabilities into 3 0 0  
Transfers of financial liabilities from 3 0 0  
Level 3 | Financial instruments at fair value      
The reconciliation of movements relating to financial instruments      
Beginning Balance, assets 29 27  
Change in fair value recognized in other comprehensive income, assets (9) 5  
Currency translation adjustments   (3)  
Impairment Loss (20)    
Ending Balance, assets   29 27
Beginning balance, liabilities 47    
Change in fair value recognized in the income statement, liabilities 2    
Purchased / incurred, liabilities   47  
Ending balance, liabilities 49 47  
Contingent consideration | Level 3 | Financial instruments at fair value      
The reconciliation of movements relating to financial instruments      
Beginning balance, liabilities 47    
Change in fair value recognized in the income statement, liabilities 2    
Purchased / incurred, liabilities   47  
Ending balance, liabilities 49 47  
Available-for-sale financial instruments | Level 3 | Financial instruments at fair value      
The reconciliation of movements relating to financial instruments      
Beginning Balance, assets 29 27  
Change in fair value recognized in other comprehensive income, assets (9) 5  
Currency translation adjustments   (3)  
Impairment Loss $ (20)    
Ending Balance, assets   $ 29 $ 27