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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assets    
Available-for-sale marketable securities: $ 81 $ 88
Total assets measured at fair value 3,215 4,817
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 777 478
(Level 1)    
Assets    
Available-for-sale marketable securities 2,943 4,337
Trading marketable securities 171 149
Total assets measured at fair value 3,114 4,486
Liabilities:    
Deferred compensation arrangements 171 149
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 171 149
(Level 2)    
Assets    
Total assets measured at fair value 101 331
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 213 23
(Level 2) | Foreign currency exchange forward contracts    
Assets    
Foreign currency exchange forward contracts 20 226
Interest rate swap asset 20 226
Liabilities:    
Foreign currency exchange forward contracts 160 23
(Level 2) | Interest rate swap    
Assets    
Foreign currency exchange forward contracts 0 17
Interest rate swap asset 0 17
Liabilities:    
Foreign currency exchange forward contracts 53 0
(Level 2) | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 81 88
(Level 2) | Available-for-sale marketable securities: | Corporate and asset-backed debt securities    
Assets    
Available-for-sale marketable securities: 38 32
(Level 2) | Available-for-sale marketable securities: | United States agency debt securities    
Assets    
Available-for-sale marketable securities: 5 2
(Level 2) | Available-for-sale marketable securities: | United States treasury debt securities    
Assets    
Available-for-sale marketable securities: 36 49
(Level 2) | Available-for-sale marketable securities: | Certificates of deposit    
Assets    
Available-for-sale marketable securities: 2 5
(Level 3)    
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Beginning 306 117
Additions 108 298
Change in estimate 9 (10)
Settlements (30) (99)
Ending 393 306
Total liabilities measured at fair value $ 393 $ 306