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INTANGIBLE ASSETS - Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year $ 11,635  
Cost at end of year 14,386 $ 11,635
Cost    
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year 12,515 10,470
Additions, net of disposals 109 117
Acquisitions through business combinations 3,248 3,208
Assets reclassified as held for sale (1) 0
Non-cash additions (disposals) 15 7
Foreign currency translation (191) (1,287)
Cost at end of year $ 15,695 $ 12,515