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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs
Pension Benefits Cost
Third QuartersNine Months
(Dollars in Millions)
2024202320242023
Service Cost Included in Labor and Fringe$6 $6 $18 $18 
Interest Cost27 28 80 84 
Expected Return on Plan Assets(42)(41)(127)(123)
Amortization of Net Loss5 7 14 21 
Total Included in Other Income - Net(10)(6)(33)(18)
Net Periodic Benefit Credit$(4)$— $(15)$—