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Reportable Segments Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 28, 2019 USD ($) | Jan. 02, 2021 USD ($) | Sep. 26, 2020 USD ($) | Jun. 27, 2020 USD ($) | Mar. 28, 2020 USD ($) | Dec. 28, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Jan. 02, 2021 USD ($) | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Net sales |  | $ 3,464 | $ 3,429 | $ 3,465 | $ 3,412 | $ 3,223 | $ 3,372 | $ 3,461 | $ 3,522 | $ 13,770 | $ 13,578 |  | $ 13,547 |
Operating profit |  |  |  |  |  |  |  |  |  | 1,761 | 1,401 |  | 1,706 |
Proceeds from divestiture of businesses |  |  |  |  |  |  |  |  |  | (7) | 1,332 |  | 0 |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 7,821 | $ 7,885 |  | $ 8,176 |
Walmart Stores Inc [Member] | Customer Concentration Risk [Member] | Sales [Member] | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  | 19.00% | 19.00% |  | 19.00% |
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | $ 8,361 | $ 8,390 |  | $ 8,688 |
Operating profit |  |  |  |  |  |  |  |  |  | $ 1,473 | 1,215 | [1] | 1,397 | [2]
Cookies, fruit and fruit flavored snacks, pie crusts and ice cream cones businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Cookies, fruit and fruit flavored snacks, pie crusts and ice cream cones businesses | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | $ 562 |  | $ 893 |
Proceeds from divestiture of businesses | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | During 2019, North America operating profit includes the recognition of multi-employer pension plan exit liabilities totaling $132 million.
[2] | Corporate operating profit in 2020 and 2019 includes the cost of certain global research and development activities that were previously included in the North America reportable segment in 2018 totaling approximately $48 million.

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