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Financial Instruments (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]            
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions $ 13,500   $ 13,500     $ 13,000
Gain (loss) recorded in Accumulated other comprehensive loss 188 $ 21 (215) $ 28    
(Gain) loss reclassified from Accumulated other comprehensive loss into Product Sales (effective portion) 27 16 56 20    
Long-term debt, euro-denominated | €         € 500  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (77)   (77)      
Gain recognized in Other income, net 10 $ 27 (29) $ 60    
Other Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivatives designated as hedging instruments, Asset Derivatives 30   30     23
Derivatives not designated as hedging instruments, Asset Derivatives 19   19     23
Accrued Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivatives designated as hedging instruments, Liability Derivatives 334   334     166
Derivatives not designated as hedging instruments, Liability Derivatives $ 47   $ 47     $ 116