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Restructuring and Transaction Costs (Schedule Of The Activity And Balances Associated With Restructuring Liabilities) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 42 $ 34
Ending balance 40 69
Reduction of workforce [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity 23  
Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity (25) 35
Other Current Liabilities [Member]    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 39 17
Ending balance 39 59
Other Current Liabilities [Member] | Reduction of workforce [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity 23  
Other Current Liabilities [Member] | Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity (23) 42
Other Long-Term Liabilities [Member]    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 3 17
Ending balance 1 10
Other Long-Term Liabilities [Member] | Prior years' restructurings [Member]    
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve activity $ (2) $ (7)