Income Taxes Summary of Activity in Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Valuation Allowance [Roll Forward]      
Balance as of beginning of year $ 30 $ 29 $ 24
Expense recognized 6 1 5
Balance as of end of year $ 36 $ 30 $ 29