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DISCONTINUED OPERATIONS - Schedule of Key Cash Flow Components (Details) - WK Kellogg Co - Discontinued Operations $ in Millions | 3 Months Ended
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Apr. 01, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Depreciation and amortization - discontinued operations | $ 19
Additions to property - discontinued operations | 42
Postretirement benefit plan expense (benefit) - discontinued operations | $ (7)

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