Consolidated Statement of Income Statement - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Income Statement [Abstract]
Net sales	$ 14,181	$ 13,770	$ 13,578
Cost of goods sold	9,621	9,043	9,197
Selling, general and administrative expense	2,808	2,966	2,980
Operating profit	1,752	1,761	1,401
Interest expense	223	281	284
Other income (expense), net	437	121	188
Income before income taxes	1,966	1,601	1,305
Income taxes	474	323	321
Earnings (loss) from unconsolidated entities	3	(14)	(7)
Net income	1,495	1,264	977
Net income (loss) attributable to noncontrolling interests	7	13	17
Net income attributable to Kellogg Company	$ 1,488	$ 1,251	$ 960
Basic	$ 4.36	$ 3.65	$ 2.81
Diluted	$ 4.33	$ 3.63	$ 2.80