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RETIREMENT PLANS (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Components of net periodic benefit cost Components of net periodic benefit (credit) cost were as follows:
Third Quarter
 Pension PlansOther Postretirement Benefit Plans
2021202020212020
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$$$$$— $— 
Interest cost15 
Expected return on assets(31)(9)(34)(9)(1)(2)
Amortization of:
Prior service credit, net— (1)— — (9)(9)
Net periodic benefit (credit) cost$(15)$(2)$(13)$— $(7)$(6)
First Nine Months
Pension PlansOther Postretirement Benefit Plans
2021202020212020
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$20 $14 $19 $13 $— $— 
Interest cost27 43 11 14 
Expected return on assets(94)(28)(101)(25)(3)(4)
Amortization of:
Prior service credit, net— (1)— — (28)(28)
Net periodic benefit (credit) cost$(47)$(6)$(39)$(1)$(22)$(18)