DISCONTINUED OPERATIONS - Schedule of Key Components of Income from Discontinued Operations (Details) - WK Kellogg Co - Discontinued Operations $ in Millions	3 Months Ended
	Apr. 01, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales - discontinued operations	$ 711
Costs of goods sold - discontinued operations	485
Selling, general and administrative expense - discontinued operations	133
Operating profit - discontinued operations	93
Interest expense - discontinued operations	10
Other income (expense), net - discontinued operations	9
Income from discontinued operations before income taxes	92
Income taxes - discontinued operations	24
Net income from discontinued operations, net of tax	$ 68