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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Assets    
Available-for-sale marketable securities: $ 88 $ 83
Total assets measured at fair value 4,817 3,894
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 478 255
(Level 1)    
Assets    
Available-for-sale marketable securities 4,337 3,616
Trading marketable securities 149 118
Total assets measured at fair value 4,486 3,734
Liabilities:    
Deferred compensation arrangements 149 118
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 149 118
(Level 2)    
Assets    
Total assets measured at fair value 331 160
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 23 20
(Level 2) | Foreign currency exchange forward contracts    
Assets    
Foreign currency exchange forward contracts 226 77
Interest rate swap asset 226 77
Liabilities:    
Foreign currency exchange forward contracts 23 20
(Level 2) | Interest rate swap asset    
Assets    
Foreign currency exchange forward contracts 17 0
Interest rate swap asset 17 0
(Level 2) | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 88 83
(Level 2) | Available-for-sale marketable securities: | Corporate and asset-backed debt securities    
Assets    
Available-for-sale marketable securities: 32 38
(Level 2) | Available-for-sale marketable securities: | United States agency debt securities    
Assets    
Available-for-sale marketable securities: 2 11
(Level 2) | Available-for-sale marketable securities: | United States treasury debt securities    
Assets    
Available-for-sale marketable securities: 49 23
(Level 2) | Available-for-sale marketable securities: | Certificates of deposit    
Assets    
Available-for-sale marketable securities: 5 11
(Level 3)    
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Beginning 117 32
Additions 298 77
Change in estimate (10) 15
Settlements (99) (7)
Ending 306 117
Total liabilities measured at fair value $ 306 $ 117