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INCOME TAXES - Change in Valuation Allowance Against Deferred Tax Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Income Tax Disclosure [Abstract] |  |  |  |  |
Balance at beginning of year | $ 263 |  | $ 248 | $ 192 |
Additions charged to income tax expense | 65 | [1] | 44 | 59 | [1]
Reductions credited to income tax expense | (34) |  | (3) | (6) |
Acquisition of noncontrolling interest | 0 |  | 0 | 13 |
Currency translation adjustments | 6 |  | (26) | (10) |
Balance at end of year | 300 |  | $ 263 | 248 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 18 |  |  | 20 |
Deferred Income Tax [Line Items] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (18) |  |  | $ (20) |
North America Cereal Business |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 21 |  |  |  |
Deferred Income Tax [Line Items] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (21) |  |  |  |
[1] | During 2021, the Company increased the valuation allowance $20 million to fully reserve for net deferred tax assets of a foreign subsidiary. During 2023, the Company established a state valuation allowance of $21 million due to projected, perpetual separate company losses for Kellanova post separation from the North America cereal business. Additionally, in 2023 the Company established a valuation allowance of $18 million related to the sale of a subsidiary.

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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