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Defined Benefit Pension Plans
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans DEFINED BENEFIT PENSION PLANS

The following table summarizes our net periodic pension cost for our defined benefit pension and postretirement plans during the three and six months ended June 30, 2020, and 2019:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Service cost
$
1

 
$
1

 
$
1

 
$
2

Other components of net periodic pension cost1:
 
 
 
 
 
 
 
Interest cost
3

 
3

 
5

 
6

Expected return on plan assets
(4
)
 
(4
)
 
(7
)
 
(7
)
Amortization of prior service cost
—

 
—

 
—

 
—

Amortization of net loss
1

 
1

 
3

 
2

Net periodic pension cost
$
1

 
$
2

 
$
2

 
$
3

1Other components of net periodic pension cost are included in other non-operating items on our Condensed Consolidated Statements of Income.