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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
Second QuartersSix Months
(Dollars in millions)2022202120222021
Service Cost Included in Labor and Fringe$8 $9 $16 $18 
Interest Cost16 13 32 27 
Expected Return on Plan Assets(47)(47)(94)(93)
Amortization of Net Loss13 19 25 37 
Total Included in Other Income - Net(18)(15)(37)(29)
Net Periodic Benefit Credit$(10)$(6)$(21)$(11)
Other Post-retirement Benefits Cost
Second QuartersSix Months
(Dollars in millions)2022202120222021
Service Cost Included in Labor and Fringe$— $— $— $— 
Interest Cost1 1 1 1 
Amortization of Prior Service Credits(2)(3)(3)(4)
Total Included in Other Income - Net(1)(2)(2)(3)
Net Periodic Benefit Credit$(1)$(2)$(2)$(3)