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Employee Benefits Employee Benefits - Multi-employer Pension Plan Exit Liability - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Jun. 27, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Multiemployer Plans [Line Items] |  |  |  |  |
Settlement agreement payment | $ 7 |  |  |  |
Settlement Agreement Gain |  | $ 5 |  |  |
Multiemployer Pension plan withdrawal pre-tax charge |  |  | $ 132 | $ (5) | $ 132
Annual Cash Obligation |  |  | $ 8 |  |
Cash obligation period |  |  | 20 years |  |

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- Definition Annual cash payments associated with multi-employer pension plan withdrawal obligation. + References No definition available. + Details
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Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The maximum number of years in which the Company is obligated to pay cash as a result of exiting multi-employer pension plans. + References No definition available. + Details
Name: | k_CashObligationPeriod
Namespace Prefix: | k_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Pre tax charge associated with Multiemployer pension plan withdrawal. + References No definition available. + Details
Name: | k_MultiemployerPensionPlanWithdrawalPreTaxCharge
Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain associated with settlement associated with multiemployer pension withdrawal liability. + References No definition available. + Details
Name: | k_SettlementAgreementGain
Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Multiemployer pension plan withdrawal settlement agreement payment. + References No definition available. + Details
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Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MultiemployerPlansLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration