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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
Pension Benefits Cost
Third QuartersNine Months
(Dollars in Millions)
2025202420252024
Service Cost Included in Labor and Fringe$5 $6 $15 $18 
Interest Cost27 27 82 80 
Expected Return on Plan Assets(40)(42)(120)(127)
Amortization of Net Loss6 5 17 14 
Total Included in Other Income - Net(7)(10)(21)(33)
Net Periodic Benefit Credit$(2)$(4)$(6)$(15)