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RETIREMENT PLANS (Tables)
9 Months Ended
Sep. 30, 2023
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
2023202220232022
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$$$$$— $— 
Interest cost19 11 
Expected return on assets(22)(6)(32)(7)(1)(1)
Amortization of:
Prior service credit, net— — — — (7)(8)
Net periodic benefit (credit) cost$$$(14)$(2)$(1)$(5)
First Nine Months
Pension PlansOther Postretirement Benefit Plans
2023202220232022
(Dollars in millions)U.S.Non-U.S.U.S.Non-U.S.
Service cost$17 $$19 $$— $— 
Interest cost58 22 33 11 20 11 
Expected return on assets(66)(19)(96)(24)(3)(3)
Amortization of:
Prior service credit, net— — — — (20)(24)
Mark-to-market pension and other postretirement benefits (gain) loss, net (1)
— — (10)— — 
Net periodic benefit (credit) cost$$$(37)$(14)$(3)$(16)