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Employee Benefits - Multi-employer Pension Plan Exit Liability - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Sep. 26, 2020 USD ($)
Multiemployer Plans [Line Items] |
Settlement Agreement Gain | $ 5
Settlement agreement payment | $ 7

X
- 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

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

X
- 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
Balance Type: | na
Period Type: | duration