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DISCONTINUED OPERATIONS - Transition Services and Supply Agreement Narrative (Details) - WK Kellogg Co - Spinoff - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 28, 2024 | Sep. 28, 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 | $ 37 | $ 128
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 | $ 22 | 84
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 | 44
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 | $ 9 | 35
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 | $ 30

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