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Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Short-term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities $ 11   $ 11  
Long-term investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments 0   355  
Level 3 | Contingent Consideration        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0 $ 28 30 $ 22
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 0 15    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (30) $ (9)    
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities     11  
Recurring | Short-term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short term investments 1      
Equity securities 11      
Recurring | Other Current Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 23   15  
Recurring | Other Noncurrent Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 2   5  
Recurring | Other Noncurrent Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities (2)   (1)  
Recurring | Long-term investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments     355  
Recurring | Other Current Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities (3)   (14)  
Contingent consideration liabilities     (30)  
Recurring | Money market funds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 364   327  
Recurring | Time deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 443   834  
Recurring | Level 1 | Short-term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short term investments 0      
Equity securities 11   11  
Recurring | Level 1 | Other Current Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0   0  
Recurring | Level 1 | Other Noncurrent Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0   0  
Recurring | Level 1 | Other Noncurrent Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities 0   0  
Recurring | Level 1 | Other Current Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities 0   0  
Contingent consideration liabilities     0  
Recurring | Level 1 | Money market funds | Cash Equivalents        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 364   327  
Recurring | Level 2 | Short-term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short term investments 1      
Equity securities 0   0  
Recurring | Level 2 | Other Current Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 23   15  
Recurring | Level 2 | Other Noncurrent Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 2   5  
Recurring | Level 2 | Other Noncurrent Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities (2)   (1)  
Recurring | Level 2 | Long-term investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments     355  
Recurring | Level 2 | Other Current Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities (3)   (14)  
Contingent consideration liabilities     0  
Recurring | Level 2 | Time deposits | Cash Equivalents        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds 443   834  
Recurring | Level 3 | Short-term Investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short term investments 0      
Equity securities 0   0  
Recurring | Level 3 | Other Current Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0   0  
Recurring | Level 3 | Other Noncurrent Assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, assets 0   0  
Recurring | Level 3 | Other Noncurrent Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities 0   0  
Recurring | Level 3 | Other Current Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative financial instruments, liabilities $ 0   0  
Contingent consideration liabilities     $ (30)