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INTANGIBLE ASSETS AND GOODWILL - Changes in Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 2,913  
Goodwill, Impairment Loss (489) $ 0
Goodwill, Foreign Currency Translation Gain (Loss) (33)  
Goodwill $ 2,391