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INTANGIBLE ASSETS - Reconciliation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year $ 9,894  
Cost at end of year 8,868  
Cost    
Disclosure of detailed information about intangible assets [line items]    
Acquisitions through business combinations, intangible assets and goodwill 17 $ 5,539
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year 10,470 4,732
Additions, net of disposals 32 46
Foreign currency translation (964) (25)
Cost at end of year $ 9,555 $ 10,292