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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]      
Net periodic benefit cost:      
Service cost $ 5 $ 7 $ 9
Interest cost 25 32 38
Expected return on plan assets (41) (38) (48)
Recognition of net actuarial loss (gain) [1] 5 7 13
Recognition of prior service cost [1] 3 1 1
Total net periodic benefit cost [2] (3) 9 13
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 27 7 5
Prior service cost arising in current year 2 3  
Recognition of net actuarial gain (loss), including settlement expense, in net periodic benefit cost [3] (9) (22) (59)
Recognition of prior service cost, including curtailment, in net periodic benefit cost [3] (7) (2) (2)
Total other comprehensive loss (earnings) 13 (14) (56)
Total 10 (5) (43)
Postretirement Benefits [Member]      
Net periodic benefit cost:      
Recognition of net actuarial loss (gain) [1]   (1) (1)
Recognition of prior service cost [1] (1) (1) (1)
Total net periodic benefit cost [2] (1) (2) (2)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year (1) (2) (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 1
Total other comprehensive loss (earnings) $ 1   1
Total   $ (2) $ (1)
[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 expenses in the accompanying consolidated statements of comprehensive earnings.
[3] These amounts include restructuring costs that were reclassified out of other comprehensive earnings in 2020, 2019 and 2018. See Note 6 for further discussion.