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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, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 1,458 $ 2,944
Assets    
Available-for-sale securities, current 72 75
Investments Fair Value Disclosure 1,885 3,424
Contingent consideration:    
Total liabilities measured at fair value 504 516
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 1,458 2,944
Trading marketable securities 182 193
Assets    
Investments Fair Value Disclosure 1,640 3,137
Deferred compensation arrangements 182 193
Contingent consideration:    
Total liabilities measured at fair value 182 193
Fair Value, Inputs, Level 2    
Assets    
Available-for-sale securities, current 72 75
Investments Fair Value Disclosure 245 287
Contingent consideration:    
Total liabilities measured at fair value 37 17
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts    
Assets    
Derivative asset 173 212
Liabilities    
Foreign currency exchange forward contracts 37 17
Fair Value, Inputs, Level 2 | Corporate and asset-backed debt securities    
Assets    
Available-for-sale securities, current 49 48
Fair Value, Inputs, Level 2 | Foreign government    
Assets    
Available-for-sale securities, current 2 2
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 14 19
Fair Value, Inputs, Level 2 | Certificates of deposit    
Assets    
Available-for-sale securities, current 2 1
Fair Value, Inputs, Level 3    
Contingent consideration:    
Beginning 306 393
Additions 0 62
Change in estimate (17) (1)
Settlements (4) (148)
Ending 285 306
Total liabilities measured at fair value $ 285 $ 306