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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets        
Investments $ 17,139 $ 20,179    
Derivative assets 340 995    
Liabilities        
Contingent consideration 1,002 891 $ 661 $ 590
Derivative liabilities 201 134    
Commercial paper        
Assets        
Investments 1,607 4,330    
Corporate notes and bonds        
Assets        
Investments 10,469 10,577    
U.S. government and agency securities        
Assets        
Investments 2,009 2,232    
Asset-backed securities        
Assets        
Investments $ 1,399 1,376    
Liabilities        
Primary weighted average life of collateral 5 years      
Mortgage-backed securities        
Assets        
Investments $ 710 796    
Foreign government bonds        
Assets        
Investments 569 519    
Equity securities        
Assets        
Investments 376 349    
Fair Value, Measurements, Recurring        
Assets        
Investments 16,319 19,242    
Other assets 820 937    
Derivative assets 340 995    
Total assets 17,479 21,174    
Liabilities        
Contingent consideration 1,002 891    
Derivative liabilities 201 134    
Total liabilities 1,203 1,025    
Fair Value, Measurements, Recurring | Purchased currency options        
Assets        
Derivative assets 180 644    
Liabilities        
Derivative liabilities 0 12    
Fair Value, Measurements, Recurring | Foreign exchange contracts        
Assets        
Derivative assets 139 331    
Liabilities        
Derivative liabilities 178 93    
Fair Value, Measurements, Recurring | Interest rate swap contracts        
Assets        
Derivative assets 21 20    
Liabilities        
Derivative liabilities 23 29    
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 280 230    
Other assets 163 148    
Derivative assets 0 0    
Total assets 443 378    
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 16,039 19,012    
Other assets 657 789    
Derivative assets 340 995    
Total assets 17,036 20,796    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 201 134    
Total liabilities 201 134    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Purchased currency options        
Assets        
Derivative assets 180 644    
Liabilities        
Derivative liabilities 0 12    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts        
Assets        
Derivative assets 139 331    
Liabilities        
Derivative liabilities 178 93    
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap contracts        
Assets        
Derivative assets 21 20    
Liabilities        
Derivative liabilities 23 29    
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 1,002 891    
Derivative liabilities 0 0    
Total liabilities 1,002 891    
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        
Assets        
Investments 1,607 4,330    
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 0 0    
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 1,607 4,330    
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds        
Assets        
Investments 10,305 10,389    
Other assets 164 188    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 10,305 10,389    
Other assets 164 188    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities        
Assets        
Investments 1,716 1,919    
Other assets 293 313    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 67 29    
Other assets 0 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 1,649 1,890    
Other assets 293 313    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Asset-backed securities        
Assets        
Investments 1,314 1,257    
Other assets 85 119    
Fair Value, Measurements, Recurring | Asset-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 1,314 1,257    
Other assets 85 119    
Fair Value, Measurements, Recurring | Asset-backed securities | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities        
Assets        
Investments 596 628    
Other assets 114 168    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 596 628    
Other assets 114 168    
Fair Value, Measurements, Recurring | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds        
Assets        
Investments 568 518    
Other assets 1 1    
Fair Value, Measurements, Recurring | Foreign government bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 568 518    
Other assets 1 1    
Fair Value, Measurements, Recurring | Foreign government bonds | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Equity securities        
Assets        
Investments 213 201    
Other assets 163 148    
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices In Active Markets for Identical Assets (Level 1)        
Assets        
Investments 213 201    
Other assets 163 148    
Fair Value, Measurements, Recurring | Equity securities | Significant Other Observable Inputs (Level 2)        
Assets        
Investments 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Equity securities | Significant Unobservable Inputs (Level 3)        
Assets        
Investments 0 0    
Other assets $ 0 $ 0