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Financial Instruments (Details)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]        
Derivatives designated as hedging instruments, Asset Derivatives $ 12     $ 24
Derivatives not designated as hedging instruments, Asset Derivatives 125     32
Derivatives designated as hedging instruments, Liability Derivatives 552     170
Derivatives not designated as hedging instruments, Liability Derivatives 42     117
Long-term debt, euro-denominated | €     € 1,250  
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions 18,200     17,800
Gain (loss) recorded in Accumulated other comprehensive loss (404) $ 7    
(Gain) loss reclassified from Accumulated other comprehensive loss into Product Sales (effective portion) 29 4    
Gain recognized in Other income, net (49) $ 18    
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (140)      
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Long-term debt, euro-denominated 750      
Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Long-term debt, euro-denominated | €     € 500  
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives designated as hedging instruments, Asset Derivatives 10     11
Derivatives not designated as hedging instruments, Asset Derivatives 122     27
Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives designated as hedging instruments, Asset Derivatives 2     13
Derivatives not designated as hedging instruments, Asset Derivatives 3     5
Accrued Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives designated as hedging instruments, Liability Derivatives 223     72
Derivatives not designated as hedging instruments, Liability Derivatives 41     116
Other Long-term Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives designated as hedging instruments, Liability Derivatives 329     98
Derivatives not designated as hedging instruments, Liability Derivatives $ 1     $ 1