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Intangible Assets and Goodwill - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 4,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 4,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 4,400    
Intangible Assets and Goodwill (Textuals)      
Amortization expense of amortizable intangible assets 2,200 $ 800  
Goodwill 30,346   $ 31,906
Patents And Trademarks      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 26,556   29,204
Intangible Assets and Goodwill (Textuals)      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 11 years    
Customer relationships and other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 13,144   12,741
Intangible Assets and Goodwill (Textuals)      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 22 years    
PHARMACEUTICAL      
Intangible Assets and Goodwill (Textuals)      
Goodwill $ 9,042   9,109
Medical Devices      
Intangible Assets and Goodwill (Textuals)      
Goodwill 12,726   $ 13,922
Patents And Trademarks | LifeScan      
Finite-Lived Intangible Assets [Line Items]      
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent 100    
Goodwill      
Finite-Lived Intangible Assets [Line Items]      
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent 1,200    
Goodwill | LifeScan      
Finite-Lived Intangible Assets [Line Items]      
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent 1,000    
Goodwill | AdvancedSterilizationProducts      
Finite-Lived Intangible Assets [Line Items]      
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent $ 200