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Goodwill and Other Intangibles - Other Intangibles (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets Excluding Goodwill [Line Items]    
Gross Carrying Amount $ 50,291 $ 50,131
Accumulated Amortization 38,860 35,948
Net 11,431 14,183
IPR&D    
Intangible Assets Excluding Goodwill [Line Items]    
Gross Carrying Amount 1,064 1,194
Net 1,064 1,194
Products and product rights    
Intangible Assets Excluding Goodwill [Line Items]    
Gross Carrying Amount 46,615 46,693
Accumulated Amortization 37,585 34,950
Net 9,030 11,743
Tradenames    
Intangible Assets Excluding Goodwill [Line Items]    
Gross Carrying Amount 209 209
Accumulated Amortization 107 97
Net 102 112
Other    
Intangible Assets Excluding Goodwill [Line Items]    
Gross Carrying Amount 2,403 2,035
Accumulated Amortization 1,168 901
Net $ 1,235 $ 1,134