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INTANGIBLE ASSETS - Accumulated Amortization (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year $ 11,635  
Cost at end of year 12,155  
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Cost at beginning of the year (880) $ (576)
Amortization (228) (173)
Foreign currency translation (20) 62
Cost at end of year $ (1,128) $ (687)