Divestiures, West Africa Investments and Acquisitions Multipro Schedule of Pro Forma Results Narrative (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 |
||||
Business Acquisition [Line Items] | ||||||||||||||
Net sales | $ 3,223 | $ 3,372 | $ 3,461 | $ 3,522 | $ 3,317 | $ 3,469 | $ 3,360 | $ 3,401 | $ 13,578 | $ 13,547 | $ 12,854 | |||
Net income attributable to Kellogg | $ 145 | $ 247 | $ 286 | $ 282 | $ (84) | [1] | $ 380 | $ 596 | $ 444 | 960 | 1,336 | 1,254 | ||
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 0 | 200 | $ 0 | |||||||||||
Multipro | ||||||||||||||
Business Acquisition [Line Items] | ||||||||||||||
Net sales | 536 | |||||||||||||
Net income attributable to Kellogg | 8 | |||||||||||||
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 245 | |||||||||||||
|