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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Net periodic benefit cost:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Hedging Activity Gain (Loss) on Hedging Activity Gain (Loss) on Hedging Activity
Pension Benefits [Member]      
Net periodic benefit cost:      
Service cost     $ 5
Interest cost $ 19 $ 18 25
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (31) (34) (41)
Recognition of net actuarial loss (gain) (6) (4) (5)
Recognition of prior service cost     3
Total net periodic benefit cost (6) (12) (3)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 11 (28) (27)
Prior service cost arising in current year     2
Recognition of net actuarial gain (loss), including settlement expense, in net periodic benefit cost (6) (23) (9)
Recognition of prior service cost, including curtailment, in net periodic benefit cost     7
Total other comprehensive loss (earnings) (17) 5 13
Total (23) (7) 10
Postretirement Benefits [Member]      
Net periodic benefit cost:      
Recognition of net actuarial loss (gain) 1 1  
Recognition of prior service cost     (1)
Total net periodic benefit cost (1) (1) (1)
Other comprehensive loss (earnings):      
Actuarial loss (gain) arising in current year 4 1 1
Prior service cost arising in current year   1  
Recognition of net actuarial gain (loss), including settlement expense, in net periodic benefit cost 1 1 1
Recognition of prior service cost, including curtailment, in net periodic benefit cost     (1)
Total other comprehensive loss (earnings) (3) $ 1 $ 1
Total $ (4)