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INTANGIBLE ASSETS - Reconciliation (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 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 12,658 $ 14,386
Cost    
Reconciliation of changes in intangible assets other than goodwill    
Cost at beginning of the year 15,695 12,515
Acquisitions through business combinations, intangible assets and goodwill 0 3,248
Additions, net of disposals 42 109
Decrease through classified as held for sale, intangible assets other than goodwill 0 (1)
Non-cash additions, intangible assets other than goodwill 0 15
Foreign currency translation (1,725) (191)
Cost at end of year $ 14,012 $ 15,695