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Fair Value Level 3 (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]
Following is a summary of losses as a result of the Company measuring long-lived assets at fair value on a non-recurring basis during the years ended December 31, 2017, 2016 and 2015, all of which were valued using Level 3 inputs.
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Long-lived assets held and used
 
$
—

 
$
—

 
$
4

Long-lived assets held for disposal/abandonment
 
—

 
—

 
2

Total
 
$
—

 
$
—

 
$
6
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes the carrying amount and fair value of the Company’s non-derivative financial instruments:
 
 
Carrying Amount(1)
 
Fair Value
 
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2017
 
 
 
 
 
 
 
 
 
 
Debt
 
$
3,750

 
$
—

 
$
3,206

 
$
49

 
$
3,255

December 31, 2016
 
 
 
 
 
 
 
 
 
 
Debt
 
$
3,542

 
$
—

 
$
3,134

 
$
9

 
$
3,143