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INTANGIBLE ASSETS - Reconciliation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year $ 11,635  
Cost at end of year 12,155  
Cost    
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year 12,515 $ 10,470
Acquisitions through business combinations, intangible assets and goodwill 520 17
Additions, net of disposals 57 32
Foreign currency translation 191 (964)
Cost at end of year $ 13,283 $ 9,555