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PENSION AND OTHER RETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense Related to Post-Retirement Plans
The components of net periodic benefit expense related to the Retirement Plans and Other Retirement Plans are as follows:
Three Months Ended March 31,
Pension Plans
Other Retirement Plans
2021202020212020
Components of net periodic expense
Service cost$5 $$1 $
Interest cost4  — 
Expected return on plan assets(7)(5)— — 
Amortization of net actuarial loss from earlier periods2 — — 
Net periodic expense$4 $$1 $