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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,

2019
 
2018
 
2019
 
2018
Total stock-based compensation expense (cost of sales, selling, general and administrative and other operating credits and charges, net)
$
2

 
$
3

 
$
5

 
$
5

Income tax provision related to stock-based compensation
$
—

 
$
(1
)
 
(1
)
 
(3
)
Impact on cash flow due to taxes paid related to net share settlement of equity awards
$
—

 
$
2

 
4

 
8