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Quarterly Financial Data (Tables) | 12 Months Ended
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Jan. 02, 2021
Quarterly Financial Information Disclosure [Abstract] |
Schedule Of Quarterly Financial Data Net Sales And Gross Profit [Table Text Block] |
| Net sales | Gross profit
(millions) | 2020 | 2019 | 2020 | 2019
First | $ | 3,412 |  | $ | 3,522 |  | $ | 1,144 |  | $ | 1,107 |
Second | 3,465 |  | 3,461 |  | 1,197 |  | 1,186 |
Third | 3,429 |  | 3,372 |  | 1,201 |  | 1,000 |
Fourth | 3,464 |  | 3,223 |  | 1,185 |  | 1,088 |
| $ | 13,770 |  | $ | 13,578 |  | $ | 4,727 |  | $ | 4,381 |
Schedule Of Quarterly Financial Data Net Income And Earnings Per Share [Table Text Block] |
| Net income (loss) attributable to Kellogg Company | Per share amounts
(millions) | 2020 | 2019 | 2020 | 2019
|  |  | Basic | Diluted | Basic | Diluted
First | $ | 347 |  | $ | 282 |  | $ | 1.01 |  | $ | 1.01 |  | $ | 0.82 |  | $ | 0.82 |
Second | 351 |  | 286 |  | 1.02 |  | 1.02 |  | 0.84 |  | 0.84 |
Third | 348 |  | 247 |  | 1.02 |  | 1.01 |  | 0.73 |  | 0.72 |
Fourth | 205 |  | 145 |  | 0.60 |  | 0.59 |  | 0.43 |  | 0.42 |
| $ | 1,251 |  | $ | 960 |  |  |  |  |
Schedule Of Quarterly Financial Data Dividends Per Share And Stock Prices [Table Text Block] |
Quarter | 2020 | 2019
First | $ | 0.57 |  | $ | 0.56 |
Second | 0.57 |  | 0.56 |
Third | 0.57 |  | 0.57 |
Fourth | 0.57 |  | 0.57 |
| $ | 2.28 |  | $ | 2.26 |
Schedule Of Quarterly Financial Data Charges Gain In Operating Profit [Table Text Block] | During 2020, the Company recorded the following in operating profit and other income (expense):
| 2020
(millions) | First | Second | Third | Fourth | Full Year
Operating profit |  |  |  |  |
Restructuring and cost reduction charges | $ | (1) |  | $ | (14) |  | $ | — |  | $ | (22) |  | $ | (37) |
Gains / (losses) on mark-to-market adjustments | 26 |  | (43) |  | 10 |  | (1) |  | (8) |
Other income (expense) |  |  |  |  |
Restructuring and cost reduction charges | $ | — |  | $ | — |  | $ | — |  | $ | 8 |  | $ | 8 |
Gains / (losses) on mark-to-market adjustments | (14) |  | (43) |  | (7) |  | (90) |  | $ | (154) |
During 2019, the Company recorded the following in operating profit and other income (expense):
| 2019
(millions) | First | Second | Third | Fourth | Full Year
Operating profit |  |  |  |  |
Restructuring and cost reduction charges | $ | (8) |  | $ | (65) |  | $ | (18) |  | $ | (27) |  | $ | (118) |
Gains / (losses) on mark-to-market adjustments | (42) |  | 46 |  | (11) |  | — |  | (7) |
Other income (expense) |  |  |  |  |
Restructuring and cost reduction charges | $ | — |  | $ | — |  | $ | — |  | $ | 5 |  | $ | 5 |
Gains / (losses) on mark-to-market adjustments | 1 |  | (11) |  | 32 |  | (120) |  | $ | (98) |

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