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Restructuring and Transaction Costs (Schedule Of The Activity And Balances Associated With Restructuring Liabilities) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 172 $ 21
Ending balance 173 18
Merger Integration [Member]    
Restructuring Cost And Reserve [Line Items]    
Merger integration 27  
Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity (26) (3)
Other Current Liabilities [Member]    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 35 20
Ending balance 54 17
Other Current Liabilities [Member] | Merger Integration [Member]    
Restructuring Cost And Reserve [Line Items]    
Merger integration 27  
Other Current Liabilities [Member] | Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity (8) (3)
Other Long-Term Liabilities [Member]    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 137 1
Ending balance 119 $ 1
Other Long-Term Liabilities [Member] | Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity $ (18)