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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
Pension Benefits Cost
First Quarters
(Dollars in Millions)
20252024
Service Cost Included in Labor and Fringe$5 $6 
Interest Cost27 26 
Expected Return on Plan Assets(40)(42)
Amortization of Net Loss6 5 
Total Included in Other Income - Net(7)(11)
Net Periodic Benefit Credit$(2)$(5)