CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 30, 2024	Apr. 01, 2023
Income Statement [Abstract]
Net sales		$ 707	$ 720
Cost of goods sold		504	540
Selling, general and administrative expense		157	156
Operating profit		46	24
Interest expense		8	0
Other income (expense), net		6	8
Income before income taxes		44	32
Income taxes		11	8
Net income		$ 33	$ 24
Per share amounts:
Basic earnings (in dollars per share)	[1]	$ 0.38	$ 0.28
Diluted earnings (in dollars per share)	[1]	$ 0.37	$ 0.28
Average shares outstanding:
Basic (in shares)		86	86
Diluted (in shares)		87	86
Actual shares outstanding at period end (in shares)		86	86

[1] On October 2, 2023, Kellanova, the former parent company of WK Kellogg Co, distributed 85,631,304 shares of WK Kellogg Co common stock to Kellanova's shareowners in connection with its Spin-Off of WK Kellogg Co (the "Spin-Off"). See Note 1 "Accounting Policies" to the Unaudited Consolidated Financial Statements for more information. Basic and diluted earnings per share were retrospectively recast for the number of shares of WK Kellogg Co common stock outstanding immediately following the Spin-Off for the quarter ended April 1, 2023.