CONSOLIDATED STATEMENT OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Income Statement [Abstract]
Net sales	$ 15,315	$ 14,181	$ 13,770
Cost of goods sold	10,700	9,621	9,043
Selling, general and administrative expense	2,980	2,808	2,966
Operating profit	1,635	1,752	1,761
Interest expense	218	223	281
Other income (expense), net	(220)	437	121
Income before income taxes	1,197	1,966	1,601
Income taxes	244	474	323
Earnings (loss) from unconsolidated entities	9	3	(14)
Net income	962	1,495	1,264
Net income (loss) attributable to noncontrolling interests	2	7	13
Net income attributable to Kellogg Company	$ 960	$ 1,488	$ 1,251
Basic	$ 2.81	$ 4.36	$ 3.65
Diluted	$ 2.79	$ 4.33	$ 3.63