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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
Pension Benefits Cost
Second QuartersSix Months
(Dollars in Millions)
2025202420252024
Service Cost Included in Labor and Fringe$5 $6 $10 $12 
Interest Cost28 27 55 53 
Expected Return on Plan Assets(40)(43)(80)(85)
Amortization of Net Loss5 4 11 9 
Total Included in Other Income - Net(7)(12)(14)(23)
Net Periodic Benefit Credit$(2)$(6)$(4)$(11)