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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | Jul. 01, 2023 | Dec. 31, 2022
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Accounting Policies [Abstract] |  |
Obligations placed in accounts payable tracking system | $ 1,100 | $ 1,100
Minimum [Member] |  |
Supplier finance program general payment timing, period | 0 days |
Maximum [Member] |  |
Supplier finance program general payment timing, period | 150 days |

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- Definition Amount of payables financed by suppliers that had been placed on the accounts payable tracking system which facilitates participating suppliers' ability to finance payment obligations from the company with designated third party financial institutions. + References No definition available. + Details
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Namespace Prefix: | k_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period when payment is expected to be made to finance provider or intermediary in supplier finance program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 405 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479468/405-50-50-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |