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 |