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Retirement Plans (Schedule of Changes In Defined Benefit Plan Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 629 $ 880  
Interest cost 34 19 $ 18
Actuarial loss (gain) (46) (215)  
Participant contributions 0 0  
Benefits paid (54) (55)  
Benefit obligation at end of year 655 629 880
Change in plan assets:      
Fair value of plan assets at beginning of year 458 671  
Actual return on plan assets (58) (172)  
Employer contributions 14 14  
Participant contributions 0 0  
Benefits paid (54) (55)  
Fair value of plan assets at end of year 476 458 671
Funded status at end of year (179) (171)  
Amounts recognized in balance sheet:      
Other current liabilities (13) (14)  
Other long-term liabilities (166) (157)  
Net amount (179) (171)  
Amounts recognized in accumulated other comprehensive earnings:      
Net actuarial loss (gain) 198 189  
Prior service cost 0 0  
Total 198 189  
Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 7 12  
Actuarial loss (gain) (1) (4)  
Participant contributions 1 1  
Benefits paid (2) (2)  
Benefit obligation at end of year 7 7 $ 12
Change in plan assets:      
Fair value of plan assets at beginning of year 0    
Employer contributions 1 1  
Participant contributions 1 1  
Benefits paid (2) (2)  
Fair value of plan assets at end of year 0 0  
Funded status at end of year (7) (7)  
Amounts recognized in balance sheet:      
Other current liabilities (1) (1)  
Other long-term liabilities (6) (6)  
Net amount (7) (7)  
Amounts recognized in accumulated other comprehensive earnings:      
Net actuarial loss (gain) (14) (15)  
Prior service cost 1 1  
Total $ (13) $ (14)