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DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 29, 2023 | Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Net Sales |  |  | $ 2,085 | $ 2,662
Disposal Group, Including Discontinued Operation, Costs of Goods Sold |  |  | 1,387 | 1,858
Disposal Group, Including Discontinued Operation, General and Administrative Expense |  |  | 479 | 381
Disposal Group, Including Discontinued Operation, Operating Profit |  |  | 219 | 423
Disposal Group, Including Discontinued Operation, Interest Expense |  |  | 26 | 17
Disposal Group, Including Discontinued Operation, Other Income |  |  | 54 |
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  | (111)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  | 247 | 295
Discontinued Operation, Tax Effect of Discontinued Operation |  |  | 71 | 64
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  | 176 | 231
Disposal Group, Including Discontinued Operation, Depreciation and Amortization |  |  | 52 | 74
Capital Expenditure, Discontinued Operations |  |  | 107 | 87
Disposal Group, Including Discontinued Operation, Postretirement benefit plan expense (benefit) |  |  | (53) | 123
Disposal Group, Including Discontinued Operation, Transition Services Agreement Cost |  | $ 157 | 52 |
Net sales from continuing operations |  | 12,749 | 13,122 | 12,653
Cost of goods sold |  | 8,204 | 8,839 | $ 8,842
WK Kellogg Co |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales from continuing operations |  | 45 | 18 |
Cost of goods sold |  | $ 39 | 16 |
WK Kellogg Co | Supply Agreement | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Period of Continuing Involvement after Disposal |  | 3 years |  |
SGA |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Transition Services Agreement Cost |  | $ 56 | 15 |
Cost of Goods and Service, Product and Service Benchmark |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Transition Services Agreement Cost |  | $ 101 | $ 37 |
2.65% U.S. Dollar Notes Due 2023 |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Debt instrument, stated interest rate | 2.65% |  |  |
Long-term Debt, Gross | $ 550 |  |  |
Revolving Credit Facility | Line of Credit | WK Kellogg Co |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount | 664 |  |  |
Payments of Dividends | $ 663 |  |  |

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