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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Pension and postretirement benefit plans:      
Beginning accumulated pension and postretirement benefits $ (127) $ (119)  
Recognition of net actuarial loss and prior service cost in earnings [1] 1 2  
Settlement of pension benefits [2] 15    
Income tax expense   (1)  
Other [3] 7    
Accumulated other comprehensive loss $ (104) $ (118) $ (127)
[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.
[2] The Merger triggered settlement payments to certain plan participants, and the expense associated with this settlement is recognized as a component of restructuring and transaction costs in the accompanying consolidated statements of comprehensive earnings
[3] Includes a remeasurement of the pension obligation due to the change in control described above which was partially offset by a change in mortality assumption.