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Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]          
Derivatives designated as hedging instruments, Asset Derivatives $ 10   $ 10   $ 22
Derivatives not designated as hedging instruments, Asset Derivatives 59   59   63
Derivatives designated as hedging instruments, Liability Derivatives 141   141   194
Derivatives not designated as hedging instruments, Liability Derivatives 180   180   92
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions 18,500   $ 18,500   20,100
Description of Net Investment Hedge Activity     We have €4.95 billion of euro-denominated long-term debt and €750 million of euro-denominated commercial paper borrowings outstanding, which qualify as a net investment hedge against our investments in European businesses. As of September 30, 2019, the net investment hedge is deemed to be effective.    
Gain (loss) recorded in Accumulated other comprehensive loss (153) $ 95 $ (125) $ (105)  
(Gain) loss reclassified from Accumulated other comprehensive loss into Product Sales (effective portion) 20 2 $ 40 (26)  
Maximum Length of Time, Foreign Currency Cash Flow Hedge     4 years 21 days    
Gain recognized in Other income, net 4 $ 16 $ 40 $ 86  
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months (57)   (57)    
Other Current Assets [Member]          
Derivatives, Fair Value [Line Items]          
Derivatives designated as hedging instruments, Asset Derivatives 5   5   10
Derivatives not designated as hedging instruments, Asset Derivatives 54   54   44
Other Noncurrent Assets [Member]          
Derivatives, Fair Value [Line Items]          
Derivatives designated as hedging instruments, Asset Derivatives 5   5   12
Derivatives not designated as hedging instruments, Asset Derivatives 5   5   19
Accrued Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivatives designated as hedging instruments, Liability Derivatives 63   63   83
Derivatives not designated as hedging instruments, Liability Derivatives 97   97   89
Other Long-term Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivatives designated as hedging instruments, Liability Derivatives 78   78   111
Derivatives not designated as hedging instruments, Liability Derivatives $ 83   $ 83   $ 3