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Restructuring and Cost Reduction Activities - Project K Expected Program Costs by Reportable Segment Narrative (Details) - Project K [Member] | 6 Months Ended
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Jun. 29, 2019
North America |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, expected cost allocation | 65.00%
Europe |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, expected cost allocation | 22.00%
Latin America |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, expected cost allocation | 3.00%
AMEA |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, expected cost allocation | 6.00%
Corporate |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, expected cost allocation | 4.00%

X
- Definition Allocation amount expected to be recognized in earnings for the specified restructuring cost. + References No definition available. + Details
Name: | k_RestructuringAndRelatedCostExpectedCostAllocation
Namespace Prefix: | k_
Data Type: | num:percentItemType
Balance Type: | na
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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=k_ProjectKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=srt_LatinAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=k_AMEAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |