CONSOLIDATED STATEMENT OF EQUITY (unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common stock	Net Parent Investment	Capital in excess of par value	Retained earnings	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2022	$ 687		$ 725	$ 0	$ 0	$ (38)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53		53
Net transfer (to)/from Kellanova	(94)		(94)
Other comprehensive income (loss)	4					4
Balance at Jul. 01, 2023	650		684	0	0	(34)
Balance at Apr. 01, 2023	673		709		0	(36)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27		27
Net transfer (to)/from Kellanova	(52)		(52)
Other comprehensive income (loss)	2					2
Balance at Jul. 01, 2023	650		$ 684	0	0	(34)
Balance (in shares) at Dec. 30, 2023		86
Balance at Dec. 30, 2023	300	$ 0		327	1	(28)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64				64
Dividends declared ($0.16 per share)	(27)				(27)
Other comprehensive income (loss)	(8)					(8)
Stock compensation	5			6	(1)
Share issuance	2			2
Balance (in shares) at Jun. 29, 2024		86
Balance at Jun. 29, 2024	$ 336	$ 0		335	37	(36)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared (in dollars per share)	$ 0.32
Balance (in shares) at Mar. 30, 2024		86
Balance at Mar. 30, 2024	$ 317	$ 0		329	20	(32)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31				31
Dividends declared ($0.16 per share)	(13)				(13)
Other comprehensive income (loss)	(4)					(4)
Stock compensation	4			5	(1)
Share issuance	1			1
Balance (in shares) at Jun. 29, 2024		86
Balance at Jun. 29, 2024	$ 336	$ 0		$ 335	$ 37	$ (36)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared (in dollars per share)	$ 0.16