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INTANGIBLE ASSETS - Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year $ 14,386  
Cost at end of year 11,767 $ 14,386
Cost    
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year 15,695 12,515
Additions, net of disposals 102 109
Acquisitions through business combinations 532 3,248
Assets reclassified as held for sale 0 (1)
Non-cash (disposals) additions(2) (2,118) 15
Foreign currency translation (978) (191)
Cost at end of year $ 13,233 $ 15,695