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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
Second QuartersSix Months
(Dollars in millions)2023202220232022
Service Cost Included in Labor and Fringe$6 $$12 $16 
Interest Cost28 16 56 32 
Expected Return on Plan Assets(41)(47)(82)(94)
Amortization of Net Loss7 13 14 25 
Total Included in Other Income - Net(6)(18)(12)(37)
Net Periodic Benefit Credit$ $(10)$ $(21)