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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 29, 2018
Receivables [Abstract]  
Summary of Activity in Allowance for Doubtful Accounts
A summary of the activity in the allowance for doubtful accounts for the last three fiscal years is as follows:
 
2018
 
2017
 
2016
Balance at beginning of year
$
26

 
$
25

 
$
23

Charged to costs and expenses
17

 
18

 
11

Customer accounts written off—net of recoveries
(14
)
 
(17
)
 
(9
)
Balance at end of year
$
29

 
$
26

 
$
25