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SEPARATION TRANSACTION - Transition Services and Supply Agreement Narrative (Details) - WK Kellogg Co - Spinoff - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Transition Services Agreement (TSA) |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense |  | $ 44 | $ 16 | $ 91
Discontinued Operation, Period of Continuing Involvement after Disposal | 2 years |  |  |
Transition Services Agreement (TSA) | COGS |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense |  | 29 | 7 | 62
Transition Services Agreement (TSA) | Selling, General and Administrative Expenses |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense |  | 15 | 9 | 29
Supply Agreement |  |  |  |
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 |  |  |
Supply Agreement | Sales |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue | $ 10 | 11 | 18 | 26
Supply Agreement | COGS |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense | $ 9 | $ 10 | $ 16 | $ 23

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