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Employee Benefits (Schedule Of Change In Benefit Obligation and Change In Plan Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States [Member]      
Change in plan assets      
Fair value of plan assets, beginning of year $ 526    
Fair value of plan assets, end of year 563 $ 526  
Foreign Plan [Member]      
Change in plan assets      
Fair value of plan assets, beginning of year 19    
Fair value of plan assets, end of year 21 19  
Pension Plan [Member] | United States [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 703 648  
Service cost 3 3 $ 3
Interest Cost 17 23 24
Actuarial loss (gain) 64 80  
Benefits paid (39) (51)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Settlements 0 0  
Foreign exchange effects 0 0  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change 0 0  
Benefit obligation, end of year 748 703 648
Change in plan assets      
Fair value of plan assets, beginning of year 526 486  
Actual return 78 92  
Employer contribution 2 2  
Benefits paid (39) (51)  
Administrative expenses paid (4) (3)  
Foreign exchange effects 0 0  
Fair value of plan assets, end of year 563 526 486
Funded status, end of year (185) (177)  
Pension Plan [Member] | Foreign Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 144 136  
Service cost 2 2 2
Interest Cost 2 3 3
Actuarial loss (gain) 14 14  
Benefits paid (4) (4)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 (4)  
Settlements 0 (1)  
Foreign exchange effects 13 (2)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change 2 0  
Benefit obligation, end of year 173 144 136
Change in plan assets      
Fair value of plan assets, beginning of year 19 17  
Actual return 1 1  
Employer contribution 4 0  
Benefits paid (4) 0  
Administrative expenses paid 0 0  
Foreign exchange effects 1 1  
Fair value of plan assets, end of year 21 19 17
Funded status, end of year (152) (125)  
Other Postretirement Benefits Plan [Member] | United States [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 65 67  
Service cost 1 1 1
Interest Cost 1 2 2
Actuarial loss (gain) 3 3  
Benefits paid (7) (8)  
Benefit obligation, end of year 63 65 67
Change in plan assets      
Fair value of plan assets, beginning of year 0 0  
Employer contribution 7 8  
Benefits paid (7) (8)  
Fair value of plan assets, end of year 0 0 0
Funded status, end of year (63) (65)  
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]      
Change in benefit obligation      
Benefit obligation, beginning of year 4 3  
Service cost 0 0 0
Interest Cost 0 0 0
Actuarial loss (gain) 0 1  
Benefits paid 0 0  
Benefit obligation, end of year 4 4 3
Change in plan assets      
Fair value of plan assets, beginning of year 0 0  
Employer contribution 0 0  
Benefits paid 0 0  
Fair value of plan assets, end of year 0 0 $ 0
Funded status, end of year $ (4) $ (4)