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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Assets    
Available-for-sale marketable securities: $ 68 $ 700
Total assets measured at fair value 3,580 4,247
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 198 152
(Level 1)    
Assets    
Available-for-sale marketable securities 3,316 3,379
Total assets measured at fair value 3,410 3,461
Liabilities:    
Deferred compensation arrangements 94 82
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 94 82
(Level 1) | Trading marketable securities    
Assets    
Trading marketable securities 94 82
(Level 2)    
Assets    
Total assets measured at fair value 170 786
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Total liabilities measured at fair value 18 14
(Level 2) | Foreign currency exchange forward contracts    
Assets    
Foreign currency exchange forward contracts 45 69
Interest rate swap asset 45 69
Liabilities:    
Foreign currency exchange forward contracts 18 10
(Level 2) | Interest rate swap asset    
Assets    
Foreign currency exchange forward contracts 57 15
Interest rate swap asset 57 15
Liabilities:    
Interest rate swap liability 0 4
(Level 2) | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 68 702
(Level 2) | Corporate and asset-backed debt securities | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 25 214
(Level 2) | Foreign government debt securities | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 0 96
(Level 2) | United States agency debt securities | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 9 120
(Level 2) | United States treasury debt securities | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 16 264
(Level 2) | Certificates of deposit | Available-for-sale marketable securities:    
Assets    
Available-for-sale marketable securities: 18 8
(Level 3)    
Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]    
Beginning balance 56 48
Additions 49 11
Change in estimate (7)  
Settlements (12) (3)
Balance at the end of the period 86 56
Total liabilities measured at fair value $ 86 $ 56