Name:	k_MaximumFutureValueOfPerformanceShares
Namespace Prefix:	k_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Time period for cumulative operating cash flow and total share holder return of the Company's common stock relative to a select group of peer companies under the share based payment performance award conditions.

No definition available.

Name:	k_PerformanceAwardConditionTimePeriod
Namespace Prefix:	k_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Performance award settlement as a percentage of the target.

No definition available.

Name:	k_PerformanceAwardSettlementStockIssuedAsPercentageOfOriginalTarget
Namespace Prefix:	k_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Performance Share Target Grant

No definition available.

Name:	k_PerformanceShareTargetGrant
Namespace Prefix:	k_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Description of award terms as to the maximum number of shares that could actually be delivered under an award upon satisfaction of a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale, expressed as a percentage of the shares under the award.

No definition available.

Name:	k_PerformanceSharesIssuedOnVestingDateMaximum
Namespace Prefix:	k_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Description of award terms as to the minimum number of shares that could actually be delivered under an award upon satisfaction of a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale, expressed as a percentage of the shares under the award.

No definition available.

Name:	k_PerformanceSharesIssuedOnVestingDateMinimum
Namespace Prefix:	k_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

Amount of cash paid to settle liability for award under share-based payment arrangement.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_AwardDateAxis=k_TwentyTwentyTwoPerformanceShareAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AwardDateAxis=k_TwentyTwentyOneAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AwardDateAxis=k_TwentyTwentyAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AwardTypeAxis=k_TwentyTwentyTwoPerformanceShareAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AwardTypeAxis=k_TwentyTwentyOnePerformanceShareAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AwardTypeAxis=k_TwentyTwentyPerformanceShareAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: