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Accounting policies -Components of net parent investment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2023 | Jun. 29, 2024 | Jul. 01, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Stock compensation |  | $ 6 | $ 2
Pension and postretirement plan benefit |  | $ 18 | 13
Net transfer (to)/from Kellanova | $ (52) |  | (94)
Kellanova |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Net transfers (to) from Kellanova |  |  | (82)
Stock compensation |  |  | 2
Pension and postretirement plan benefit |  |  | (14)
Net transfer (to)/from Kellanova |  |  | $ (94)

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 808 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479402/808-10-50-1 + Details
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- Definition Amount of noncash expense (reversal of expense) for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 60 -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481423/505-60-25-2 + Details
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