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Financial Instruments, Derivatives and Fair Value Measures - Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Designated as hedging instrument | Yen-denominated long-term debt | Net investment hedges    
Derivative instruments, notional amount and fair value    
Term loan $ 554 $ 546
Debt Instrument, Term 5 years 5 years
Designated as hedging instrument | Foreign currency forward exchange contracts | Cash flow hedges    
Derivative instruments, notional amount and fair value    
Gross notional amount $ 7,000 $ 6,800
Minimum length of time over which accumulated gains and losses will be recognized in Cost of products sold 12 months  
Maximum length of time over which accumulated gains and losses will be recognized in Cost of products sold 18 months  
Designated as hedging instrument | Interest rate swaps | Fair value hedges    
Derivative instruments, notional amount and fair value    
Gross notional amount $ 2,900 2,900
Not designated as hedging instrument | Foreign currency forward exchange contracts    
Derivative instruments, notional amount and fair value    
Gross notional amount $ 9,500 $ 9,100