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Quarterly Financial Data Narrative (Details)	Jan. 02, 2021
Quarterly Financial Information Disclosure [Abstract]
Number Of Shareholders	30,305

X

- Definition

Number of Shareholders of record at year-end.

+ References

No definition available.

+ Details

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Namespace Prefix:	k_
Data Type:	xbrli:integerItemType
Balance Type:	na
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