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RETIREMENT PLANS (Tables)
3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
Components of net periodic benefit (credit) cost were as follows:
First Quarter
 Pension PlansOther Postretirement Benefit Plans
2020201920202019
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$ $ $ $ $—  $—  
Interest cost14   19     
Expected return on assets(34) (8) (32) (8) (1) (1) 
Amortization of:
Prior service credit, net—  —  —  —  (10) (10) 
Net periodic benefit (credit) cost$(13) $—  $(6) $—  $(6) $(5)