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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
First Quarters
(Dollars in millions)20232022
Service Cost Included in Labor and Fringe$6 $
Interest Cost28 16 
Expected Return on Plan Assets(41)(47)
Amortization of Net Loss7 12 
Total Included in Other Income - Net(6)(19)
Net Periodic Benefit Credit$ $(11)