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Defined Benefit Pension Plans
 3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans DEFINED BENEFIT PENSION PLANSThe following table summarizes our net periodic pension cost for our defined benefit pension and postretirement plans during the three months ended March 31, 2021, and 2020:
Three Months Ended March 31,
20212020
Service cost$— $1 
Other components of net periodic pension cost1:
Interest cost2 3 
Expected return on plan assets(3)(4)
Amortization of prior service cost— — 
Amortization of net loss1 1 
Net periodic pension cost$1 $1 
1Other components of net periodic pension cost are included in Other non-operating items on our Condensed Consolidated Statements of Income.