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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Performance Awards Settlement Stock Issued Value

No definition available.

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Namespace Prefix:	k_
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Performance Share Target Grant

No definition available.

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

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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Data Type:	xbrli:stringItemType
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Percentage of vesting of share-based compensation awards.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Name:	us-gaap_AwardTypeAxis=k_PerformanceSharesTargetGrantTwentySeventeenMember
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Name:	us-gaap_AwardTypeAxis=k_PerformanceSharesTargetGrantTwentyEighteenMember
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Data Type:	na
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Name:	us-gaap_AwardTypeAxis=k_PerformanceSharesTargetGrantTwentyFifteenMember
Namespace Prefix:
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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
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