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Quarterly Financial Data Net sales and gross profit (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 3,223 $ 3,372 $ 3,461 $ 3,522 $ 3,317 $ 3,469 $ 3,360 $ 3,401 $ 13,578 $ 13,547 $ 12,854
Gross Profit $ 1,088 $ 1,000 $ 1,186 $ 1,107 $ 1,089 $ 1,176 $ 1,209 $ 1,252 $ 4,381 $ 4,726