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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] e 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.