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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
Third QuartersNine Months
(Dollars in millions)2023202220232022
Service Cost Included in Labor and Fringe$6 $$18 $24 
Interest Cost28 16 84 48 
Expected Return on Plan Assets(41)(47)(123)(141)
Amortization of Net Loss7 12 21 37 
Total Included in Other Income - Net(6)(19)(18)(56)
Net Periodic Benefit Credit$ $(11)$ $(32)