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SEPARATION TRANSACTION - Transition Services and Supply Agreement Narrative (Details) - WK Kellogg Co - Spinoff - USD ($) $ in Millions | 3 Months Ended
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Mar. 29, 2025 | Mar. 30, 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 | $ 14 | $ 47
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 | $ 6 | 33
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 | $ 8 | 14
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 | $ 8 | 15
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 | $ 7 | $ 13

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