The time period to exercise the purchase option defined in the agreement as part of an acquisition.

No definition available.

Name:	k_AcquisitionPurchaseOptionTimePeriod
Namespace Prefix:	k_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Adjustments made to the value of Investments in Unconsolidated Entities

+ References

No definition available.

+ Details

Name:	k_AdjustmenttoInvestmentsinUnconsolidatedEntities
Namespace Prefix:	k_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

+ Details

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

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

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=k_MultiproMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	k_EquityInvestmentAcquisitionAxis=k_PurchaseoptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investment in Unconsolidated Entities - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2015	Jul. 02, 2016	Jul. 02, 2016
Schedule of Equity Method Investments [Line Items]
Adjustment to investment in unconsolidated entities			$ 5
Multipro [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Joint Venture	$ 445
Equity method investment, ownership percentage	50.00%
Adjustment to investment in unconsolidated entities		$ (28)
Time period to exercise purchase option	1 year
Multipro [Member] \| Purchase option [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	24.50%