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Other Intangibles - Finite-Lived Intangible Assets Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Intangible asset impairment charges related to finite-lived intangible assets   $ 347  
Other Intangibles, Net $ 15,138   $ 17,305
Intron A      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset impairment charges related to finite-lived intangible assets 47    
Other Intangibles, Net $ 19    
Zontivity      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset impairment charges related to finite-lived intangible assets   252  
Grastek/Ragwitek [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset impairment charges related to finite-lived intangible assets   $ 95