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Retirement Plans (Schedule of Changes In Defined Benefit Plan Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 655 $ 629  
Interest cost 31 34 $ 19
Actuarial loss (gain) (14) 46  
Participant contributions 0 0  
Benefits paid (52) (54)  
Benefit obligation at end of year 620 655 629
Change in plan assets:      
Fair value of plan assets at beginning of year 476 458  
Actual return on plan assets 9 58  
Employer contributions 14 14  
Participant contributions 0 0  
Benefits paid (52) (54)  
Fair value of plan assets at end of year 447 476 458
Funded status at end of year (173) (179)  
Amounts recognized in balance sheet:      
Other current liabilities (13) (13)  
Other long-term liabilities (160) (166)  
Net amount (173) (179)  
Amounts recognized in accumulated other comprehensive earnings:      
Net actuarial loss (gain) 195 198  
Prior service cost 0 0  
Total 195 198  
Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 7 7  
Actuarial loss (gain) 0 1  
Participant contributions 1 1  
Benefits paid (1) (2)  
Benefit obligation at end of year 7 7 $ 7
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) (13) (14)  
Prior service cost 1 1  
Total $ (12) $ (13)