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RETIREMENT PLANS (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Components of net periodic benefit (credit) cost were as follows:
Second Quarter
 Pension PlansOther Postretirement Benefit Plans
2020201920202019
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$ $ $ $ $—  $—  
Interest cost14   19     
Expected return on assets(33) (8) (33) (8) (1) (1) 
Amortization of:
Prior service credit, net—  —  —  —  (9) (10) 
Net periodic benefit (credit) cost$(13) $(1) $(7) $ $(6) $(4) 
First Six Months
Pension PlansOther Postretirement Benefit Plans
2020201920202019
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$13  $ $14  $ $—  $—  
Interest cost28   38  10   13  
Expected return on assets(67) (16) (65) (16) (2) (2) 
Amortization of:
Prior service credit, net—  —  —  —  (19) (20) 
Net periodic benefit (credit) cost$(26) $(1) $(13) $ $(12) $(9)