Assets Held for Sale (Tables)
 12 Months Ended
Dec. 28, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Assets Held for Sale
The changes in assets held for sale for fiscal years 2019 and 2018 were as follows:
 
2019
 
2018
Balance as of beginning of year
$
7

 
$
5

Transfers in
—

 
3

Assets sold
(6
)
 
—

Tangible asset impairment charges
—

 
(1
)
Balance as of end of the year
$
1

 
$
7