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Defined Benefit Pension Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] :
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
1

 
$
1

 
$
3

 
$
3

Other components of net periodic pension cost1:
 
 
 
 
 
 
 
Interest cost
3

 
3

 
9

 
9

Expected return on plan assets
(4
)
 
(3
)
 
(11
)
 
(10
)
Amortization of prior service cost
—

 
—

 
—

 
—

Amortization of net loss
1

 
2

 
4

 
5

Net periodic pension cost
$
2

 
$
2

 
$
5

 
$
7