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Divestiures, West Africa Investments and Acquisitions Multipro Schedule of Pro Forma Results Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2021 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Jun. 30, 2018 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 3,464 | $ 3,429 | $ 3,465 | $ 3,412 | $ 3,223 | $ 3,372 | $ 3,461 | $ 3,522 |  | $ 13,770 | $ 13,578 | $ 13,547
Net income attributable to Kellogg | $ 205 | $ 348 | $ 351 | $ 347 | $ 145 | $ 247 | $ 286 | $ 282 |  | 1,251 | 960 | 1,336
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 200
Multipro |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 536
Net income attributable to Kellogg |  |  |  |  |  |  |  |  |  |  |  | 8
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | $ 245 |  |  | $ 245

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