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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 1,918 $ 2,542 $ 2,592 $ 3,316
Assets        
Available-for-sale securities, current 292 251    
Investments Fair Value Disclosure 2,380 2,978    
Contingent consideration:        
Total liabilities measured at fair value 249 190    
Fair Value, Inputs, Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 1,918 2,542    
Trading marketable securities 130 121    
Assets        
Investments Fair Value Disclosure 2,048 2,663    
Deferred compensation arrangements 130 121    
Contingent consideration:        
Total liabilities measured at fair value 130 121    
Fair Value, Inputs, Level 2        
Assets        
Investments Fair Value Disclosure 332 315    
Contingent consideration:        
Total liabilities measured at fair value 18 37    
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts        
Assets        
Derivative asset 40 15    
Liabilities        
Foreign currency exchange forward contracts 18 37    
Fair Value, Inputs, Level 2 | Interest rate swap asset        
Assets        
Derivative asset 0 49    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities:        
Assets        
Available-for-sale securities, current 292 251    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Corporate and asset-backed debt securities        
Assets        
Available-for-sale securities, current 53 125    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Foreign government debt securities        
Assets        
Available-for-sale securities, current 112 2    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States agency debt securities        
Assets        
Available-for-sale securities, current 2 27    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States Treasury debt securities        
Assets        
Available-for-sale securities, current 33 70    
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Certificates of deposit        
Assets        
Available-for-sale securities, current 92 27    
Fair Value, Inputs, Level 3        
Contingent consideration:        
Beginning 32 86    
Additions 78 3    
Change in estimate 0 2    
Settlements (9) (59)    
Ending 101 32    
Total liabilities measured at fair value $ 101 $ 32