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Other Comprehensive Earnings (Loss) (Components Of Other Comprehensive Earnings (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension and postretirement benefit plans:        
Beginning accumulated pension and postretirement benefits $ (101) $ (117) $ (127) $ (119)
Recognition of net actuarial loss and prior service cost in earnings [1] 1 1 2 4
Settlement of pension benefits [2]     18  
Income tax expense       (1)
Other [3]     7  
Accumulated other comprehensive loss, net of tax $ (100) $ (116) $ (100) $ (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.
[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] Other includes a remeasurement of the pension obligation due to the Merger, which was partially offset by a change in mortality assumption.