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Retirement Plans (Schedule of Net Periodic Benefit Cost And Other Comprehensive Loss (Earnings) For Pension And Other Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]      
Net periodic benefit cost:      
Service cost   $ 5 $ 7
Interest cost $ 18 25 32
Expected return on plan assets (34) (41) (38)
Recognition of net actuarial loss (gain) [1] 4 5 7
Recognition of prior service cost [1]   3 1
Total net periodic benefit cost [2] (12) (3) 9
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 28 27 7
Prior service cost arising in current year   2 3
Recognition of net actuarial gain (loss), including settlement expense, in net periodic benefit cost [3] (23) (9) (22)
Recognition of prior service cost, including curtailment, in net periodic benefit cost [3]   (7) (2)
Total other comprehensive loss (earnings) 5 13 (14)
Total (7) 10 (5)
Postretirement Benefits [Member]      
Net periodic benefit cost:      
Recognition of net actuarial loss (gain) [1] (1)   (1)
Recognition of prior service cost [1]   (1) (1)
Total net periodic benefit cost [2] (1) (1) (2)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year (1) (1) (2)
Prior service cost arising in current year 1    
Recognition of net actuarial gain (loss), including settlement expense, in net periodic benefit cost [3] 1 1 1
Recognition of prior service cost, including curtailment, in net periodic benefit cost [3]   1 1
Total other comprehensive loss (earnings) $ 1 $ 1  
Total     $ (2)
[1] These net periodic benefit costs were reclassified out of other comprehensive earnings in the current period.
[2] The service cost component of net periodic benefit cost is included in G&A expense and the remaining components of net periodic benefit costs are included in other, net in the accompanying consolidated statements of comprehensive earnings.
[3] These amounts include restructuring costs that were reclassified out of other comprehensive earnings in 2021, 2020 and 2019. See Note 6 for further discussion.