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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Expense/(Income) Related to Net Benefit Expense
Pension Benefits Cost
(Dollars in millions)Second QuartersSix Months
2020201920202019
Service Cost Included in Labor and Fringe$10  $ $20  $16  
Interest Cost21  26  41  52  
Expected Return on Plan Assets(44) (43) (87) (86) 
Amortization of Net Loss14   28  15  
Total Included in Other Income - Net(9) (9) (18) (19) 
Net Periodic Benefit Cost/(Credit)$ $(1) $ $(3) 
Other Post-retirement Benefits Cost
(Dollars in millions)Second QuartersSix Months
2020201920202019
Service Cost Included in Labor and Fringe$ $ $ $ 
Interest Cost—     
Amortization of Prior Service Costs(1) (1) (3) (3) 
Total Included in Other Income - Net(1) —  (2) (1) 
Net Periodic Benefit Cost/(Credit)$—  $ $(1) $—