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Fair Value Measurements (Valuation Of Financial Instruments By Pricing Categories) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 1,044 $ 2,944
Assets    
Available-for-sale securities, current 83 75
Investments Fair Value Disclosure 1,633 3,424
Contingent consideration:    
Total liabilities measured at fair value 430 516
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 1,044 2,944
Trading marketable securities 160 193
Assets    
Investments Fair Value Disclosure 1,204 3,137
Deferred compensation arrangements 160 193
Contingent consideration:    
Total liabilities measured at fair value 160 193
Fair Value, Inputs, Level 2    
Assets    
Available-for-sale securities, current 83 75
Investments Fair Value Disclosure 429 287
Contingent consideration:    
Total liabilities measured at fair value 14 17
Fair Value, Inputs, Level 2 | Foreign currency exchange forward contracts    
Assets    
Derivative asset 346 212
Liabilities    
Foreign currency exchange forward contracts 14 17
Fair Value, Inputs, Level 2 | Corporate and asset-backed debt securities    
Assets    
Available-for-sale securities, current 47 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 4 5
Fair Value, Inputs, Level 2 | United States Treasury debt securities    
Assets    
Available-for-sale securities, current 27 19
Fair Value, Inputs, Level 2 | Certificates of deposit    
Assets    
Available-for-sale securities, current 3 1
Fair Value, Inputs, Level 3    
Contingent consideration:    
Beginning 306 393
Additions 1 62
Change in estimate (27) (1)
Settlements (24) (148)
Ending 256 306
Total liabilities measured at fair value $ 256 $ 306