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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Assets        
Available-for-sale Securities, Current     $ 66 $ 68
Investments Fair Value Disclosure     3,457 3,580
Liabilities        
Financial and Nonfinancial Liabilities, Fair Value Disclosure     191 198
Interest rate swap liability        
Assets        
Derivative Asset     0 0
Fair Value, Inputs, Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents     3,213 3,316
Assets        
Investments Fair Value Disclosure     3,316 3,410
Deferred compensation arrangements     103 94
Liabilities        
Financial and Nonfinancial Liabilities, Fair Value Disclosure     103 94
Fair Value, Inputs, Level 1 | Trading marketable securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading marketable securities     103 94
Fair Value, Inputs, Level 2        
Assets        
Investments Fair Value Disclosure     141 170
Liabilities        
Financial and Nonfinancial Liabilities, Fair Value Disclosure     22 18
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts        
Assets        
Derivative Asset     20 45
Liabilities        
Foreign currency exchange forward contracts     22 18
Fair Value, Inputs, Level 2 | Interest rate swap liability        
Assets        
Derivative Asset     55 57
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities:        
Assets        
Available-for-sale Securities, Current     66 68
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Corporate and asset-backed debt securities        
Assets        
Available-for-sale Securities, Current     23 25
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States agency debt securities        
Assets        
Available-for-sale Securities, Current     10 9
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | United States treasury debt securities        
Assets        
Available-for-sale Securities, Current     16 16
Fair Value, Inputs, Level 2 | Available-for-sale marketable securities: | Certificates of deposit        
Assets        
Available-for-sale Securities, Current     17 18
Fair Value, Inputs, Level 3        
Liabilities        
Financial and Nonfinancial Liabilities, Fair Value Disclosure     66 86
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration [Abstract]        
Beginning balance $ 86 $ 56    
Additions 3 49    
Adjustments 0 (7)    
Payments (23) (12)    
Balance at the end of the period 66 86    
Total liabilities measured at fair value $ 86 $ 56 $ 66 $ 86