Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Income Statement [Abstract]
Net sales	$ 3,672	$ 3,584
Cost of goods sold	2,513	2,418
Selling, general and administrative expense	642	694
Operating profit	517	472
Interest expense	56	59
Other income (expense), net	74	69
Income before income taxes	535	482
Income Tax Expense (Benefit)	112	109
Earnings (loss) from unconsolidated entities	1	(2)
Net income	424	371
Net income attributable to noncontrolling interests	2	3
Net income attributable to Kellogg Company	$ 422	$ 368
Per share amounts:
Basic earnings (in dollars per share)	$ 1.24	$ 1.07
Diluted earnings (in dollars per share)	$ 1.23	$ 1.07
Average shares outstanding:
Basic (in shares)	340	342
Diluted (in shares)	342	344
Actual shares outstanding at period end (in shares)	338	340