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Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 02, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Jun. 30, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Amortization |  |  |  |  | $ 20 | $ 16
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  |  |  | 0 | 200
Operating profit |  | $ 263 | $ 396 |  | 1,041 | 1,380
Net income attributable to Kellogg Company |  | $ 247 | 380 |  | 815 | $ 1,420
Tolaram Africa Foods (TAF) PTE LTD |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |  |
Payments to acquire business, gross | $ 419 |  |  |  |  |
Equity method investment aggregate cost | $ 458 |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  | $ 45 |  |
TAF Investment in Affiliated Food Manufacturer |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |  |  |
Affiliated Food Manufacturer |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 24.50% |  |  |  |  |
Multipro |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity method investment incremental ownership percentage change | 1.00% |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  | 3,469 |  | 10,512 |
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 380 |  | $ 1,420 |
Equity method investment, ownership percentage | 51.00% |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  |  | $ 245 |  |

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