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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
First Quarters
(Dollars in millions)20222021
Service Cost Included in Labor and Fringe$8 $9 
Interest Cost16 14 
Expected Return on Plan Assets(47)(46)
Amortization of Net Loss12 18 
Total Included in Other Income - Net(19)(14)
Net Periodic Benefit Credit$(11)$(5)
Other Post-retirement Benefits Cost
First Quarters
(Dollars in millions)20222021
Service Cost Included in Labor and Fringe$— $— 
Interest Cost— — 
Amortization of Prior Service Credits(1)(1)
Total Included in Other Income - Net(1)(1)
Net Periodic Benefit Credit$(1)$(1)