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9. Property and Equipment (Tables)
6 Months Ended
Jun. 29, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment Table
   Useful Life (Years)  June 29, 2019   December 29, 2018 
Buildings and improvements  18-30  $68   $67 
Equipment (including computer software)  3-15   6,267    6,049 
Projects under construction      125    58 
Property and equipment      6,460    6,174 
Less accumulated depreciation and amortization      (5,720)   (5,557)
Total property and equipment, net     $740   $617