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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension and postretirement benefit plans:        
Beginning accumulated pension and postretirement benefits $ (104) $ (118) $ (127) $ (119)
Recognition of net actuarial loss and prior service cost in earnings [1]   1 1 3
Settlement of pension benefits [2] 3   18  
Income tax expense       (1)
Other [3]     7  
Accumulated other comprehensive loss, net of tax $ (101) $ (117) $ (101) $ (117)
[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 Merger, which was partially offset by a change in mortality assumption.