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Fair Value Measurements Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
The following table summarizes the carrying amount and fair value of the Company's non-derivative financial instruments at December 31, 2017:
 
 
Carrying Amount
 
Fair Value
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2017
 
 
 
 
 
 
 
 
 
 
Debt
 
$
1,228

 
$
—

 
$
1,391

 
$
—

 
$
1,391

 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
Debt
 
$
1,203

 
$
—

 
$
1,243

 
$
—

 
$
1,243