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PENSION AND OTHER RETIREMENT BENEFITS (Tables)
9 Months Ended
Sep. 30, 2020
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 are as follows:
Three Months Ended September 30,
Pension Plans
Other Retirement Plans
2020201920202019
Components of net periodic expense
Service cost$5 $$ $
Interest cost
4 1 — 
Expected return on plan assets
(5)(5)— — 
Amortization of net actuarial loss from earlier periods
2 — — 
Net periodic expense
$6 $$1 $

Nine Months Ended September 30,
Pension Plans
Other Retirement Plans
2020201920202019
Components of net periodic expense
Service cost$13 $12 $2 $
Interest cost
13 15 1 
Expected return on plan assets
(15)(15) — 
Amortization of net actuarial loss from earlier periods
5  — 
Net periodic expense
$16 $15 $3 $