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Retirement Plans (Schedule of Changes In Defined Benefit Plan Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 981 $ 924  
Service cost   5 $ 7
Interest cost 18 25 32
Actuarial loss (gain) (18) 116  
Plan amendments   2  
Plan curtailments 22 (14)  
Plan settlements (73) (28)  
Benefits paid (50) (49)  
Benefit obligation at end of year 880 981 924
Change in plan assets:      
Fair value of plan assets at beginning of year 745 694  
Actual return on plan assets (11) 114  
Employer contributions 60 14  
Plan settlements (73) (28)  
Benefits paid (50) (49)  
Fair value of plan assets at end of year 671 745 694
Funded status at end of year (209) (236)  
Amounts recognized in balance sheet:      
Other long-term assets 6 10  
Other current liabilities (14) (14)  
Other long-term liabilities (201) (232)  
Net amount (209) (236)  
Amounts recognized in accumulated other comprehensive earnings:      
Net actuarial loss (gain) 206 201  
Total 206 201  
Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 13 14  
Actuarial loss (gain) (1) (1)  
Plan amendments 1    
Plan curtailments   1  
Participant contributions 2 2  
Benefits paid (3) (3)  
Benefit obligation at end of year 12 13 $ 14
Change in plan assets:      
Employer contributions 1 1  
Participant contributions 2 2  
Benefits paid (3) (3)  
Funded status at end of year (12) (13)  
Amounts recognized in balance sheet:      
Other current liabilities (2) (2)  
Other long-term liabilities (9) (11)  
Net amount (11) (13)  
Amounts recognized in accumulated other comprehensive earnings:      
Net actuarial loss (gain) (12) (12)  
Prior service cost 1    
Total $ (11) $ (12)