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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill, Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill $ 53,194 $ 58,730
BioPharma | Held-for-sale | Healthcare    
Goodwill [Line Items]    
Goodwill $ 5,548