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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. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 300 | $ 263 | $ 248
Additions charged to income tax expense | 16 | 65 | 44
Reductions credited to income tax expense | (41) | (34) | (3)
Currency translation adjustments | (26) | 6 | (26)
Balance at end of year | $ 249 | $ 300 | $ 263

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- Definition The amount of the increase in the period in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of the decrease in the period in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Valuation allowance change retated to currency translation adjustments. + References No definition available. + Details
Name: | k_ValuationAllowanceCurrencyTranslationAdjustments
Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration