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Supplemental Information (Tables)
 12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Cash Flow Information
Cash Flow Information
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Cash paid for:
 
 
 
 
 
 
Interest paid, net of interest capitalized
 
$
140

 
$
154

 
$
46

Income taxes paid
 
376

 
84

 
3