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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Pension and postretirement benefit plans:            
Beginning accumulated pension and postretirement benefits $ (115) $ (131) $ (116) $ (132)    
Recognition of net actuarial loss and prior service cost in earnings [1] 2 2 3 3    
Income tax benefit (expense) (1) (1) [1] (1) (1) [1]    
Accumulated other comprehensive loss $ (114) $ (130) $ (114) $ (130) $ (114) $ (116)
[1] Recognition of net actuarial loss and prior service cost are included in the computation of net periodic benefit cost, which is a component of other, net in the accompanying consolidated statements of comprehensive earnings.