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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, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 2,238 $ 2,943
Assets    
Available-for-sale securities, current 74 81
Investments Fair Value Disclosure 2,609 3,215
Contingent consideration:    
Total liabilities measured at fair value 588 777
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,238 2,943
Trading marketable securities 170 171
Assets    
Investments Fair Value Disclosure 2,408 3,114
Deferred compensation arrangements 170 171
Contingent consideration:    
Total liabilities measured at fair value 170 171
Fair Value, Inputs, Level 2    
Assets    
Available-for-sale securities, current 74 81
Investments Fair Value Disclosure 201 101
Contingent consideration:    
Total liabilities measured at fair value 42 213
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts    
Assets    
Derivative asset 127 20
Liabilities    
Foreign currency exchange forward contracts 42 160
Fair Value, Inputs, Level 2 | Interest Rate Swap    
Liabilities    
Foreign currency exchange forward contracts 0 53
Fair Value, Inputs, Level 2 | Corporate and asset-backed debt securities    
Assets    
Available-for-sale securities, current 37 38
Fair Value, Inputs, Level 2 | United States agency debt securities    
Assets    
Available-for-sale securities, current 5 5
Fair Value, Inputs, Level 2 | United States Treasury debt securities    
Assets    
Available-for-sale securities, current 29 36
Fair Value, Inputs, Level 2 | Certificates of deposit    
Assets    
Available-for-sale securities, current 3 2
Fair Value, Inputs, Level 3    
Contingent consideration:    
Beginning 393 306
Additions 4 108
Change in estimate (2) 9
Settlements (19) (30)
Ending 376 393
Total liabilities measured at fair value $ 376 $ 393