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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments $ 14,206 $ 14,908    
Investments 332      
Assets        
Derivative assets 109 130    
Liabilities        
Contingent consideration 919 935 $ 925 $ 891
Derivative liabilities 324 217    
Commercial paper        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 130 159    
Corporate notes and bonds        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 9,860 9,806    
U.S. government and agency securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 1,810 2,042    
Asset-backed securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments $ 1,569 1,542    
Liabilities        
Primary weighted average life of collateral 5 years      
Foreign government bonds        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments $ 759 733    
Mortgage-backed securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 78 626    
Fair Value, Measurements, Recurring        
Assets        
Investments 13,896 14,531    
Other assets 642 652    
Derivative assets 109 130    
Total assets 14,647 15,313    
Liabilities        
Contingent consideration 919 935    
Derivative liabilities 324 217    
Total liabilities 1,243 1,152    
Fair Value, Measurements, Recurring | Purchased currency options        
Assets        
Derivative assets 46 80    
Liabilities        
Derivative liabilities 1 0    
Fair Value, Measurements, Recurring | Foreign exchange contracts        
Assets        
Derivative assets 63 48    
Liabilities        
Derivative liabilities 208 162    
Fair Value, Measurements, Recurring | Interest rate swap contracts        
Assets        
Derivative assets 0 2    
Liabilities        
Derivative liabilities 115 55    
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 164 172    
Other assets 232 171    
Derivative assets 0 0    
Total assets 396 343    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 0 0    
Total liabilities 0 0    
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Purchased currency options        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign exchange contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 13,732 14,359    
Other assets 410 481    
Derivative assets 109 130    
Total assets 14,251 14,970    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 324 217    
Total liabilities 324 217    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options        
Assets        
Derivative assets 46 80    
Liabilities        
Derivative liabilities 1 0    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts        
Assets        
Derivative assets 63 48    
Liabilities        
Derivative liabilities 208 162    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts        
Assets        
Derivative assets 0 2    
Liabilities        
Derivative liabilities 115 55    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Derivative assets 0 0    
Total assets 0 0    
Liabilities        
Contingent consideration 919 935    
Derivative liabilities 0 0    
Total liabilities 919 935    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Purchased currency options        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Commercial paper        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 130 159    
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 130 159    
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 9,741 9,678    
Assets        
Other assets 119 128    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 9,741 9,678    
Assets        
Other assets 119 128    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 1,585 1,835    
Assets        
Other assets 225 207    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 68    
Assets        
Other assets 64 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 1,585 1,767    
Assets        
Other assets 161 207    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Asset-backed securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 1,517 1,476    
Assets        
Other assets 52 66    
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 1,517 1,476    
Assets        
Other assets 52 66    
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 759 732    
Assets        
Other assets 0 1    
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 759 732    
Assets        
Other assets 0 1    
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 547    
Assets        
Other assets 78 79    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 547    
Assets        
Other assets 78 79    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Publicly traded equity securities        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 164 104    
Assets        
Other assets 168 171    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 164 104    
Assets        
Other assets 168 171    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Other Observable Inputs (Level 2)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Significant Unobservable Inputs (Level 3)        
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis [Line Items]        
Investments 0 0    
Assets        
Other assets $ 0 $ 0