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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Assets    
Available-for-sale marketable securities: $ 83 $ 251
Total assets measured at fair value 3,894 2,978
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 255 190
(Level 1)    
Assets    
Available-for-sale marketable securities 3,616 2,542
Trading marketable securities 118 121
Total assets measured at fair value 3,734 2,663
Liabilities:    
Deferred compensation arrangements 118 121
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 118 121
(Level 2)    
Assets    
Total assets measured at fair value 160 315
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 20 37
(Level 2) | Foreign currency exchange forward contracts    
Assets    
Foreign currency exchange forward contracts 77 15
Interest rate swap asset 77 15
Liabilities:    
Foreign currency exchange forward contracts 20 37
(Level 2) | Interest rate swap asset    
Assets    
Foreign currency exchange forward contracts 0 49
Interest rate swap asset 0 49
(Level 2) | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 83 251
(Level 2) | Available-for-sale marketable securities: | Corporate and asset-backed debt securities    
Assets    
Available-for-sale marketable securities: 38 125
(Level 2) | Available-for-sale marketable securities: | Foreign government debt securities    
Assets    
Available-for-sale marketable securities: 0 2
(Level 2) | Available-for-sale marketable securities: | United States agency debt securities    
Assets    
Available-for-sale marketable securities: 11 27
(Level 2) | Available-for-sale marketable securities: | United States treasury debt securities    
Assets    
Available-for-sale marketable securities: 23 70
(Level 2) | Available-for-sale marketable securities: | Certificates of deposit    
Assets    
Available-for-sale marketable securities: 11 27
(Level 3)    
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Beginning 32 86
Additions 77 3
Change in estimate 15 2
Settlements (7) (59)
Ending 117 32
Total liabilities measured at fair value $ 117 $ 32