Quarterly Financial Data (Tables)

12 Months Ended

Jan. 02, 2021

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data Net Sales And Gross Profit [Table Text Block]

	Net sales				Gross profit
(millions)	2020		2019		2020		2019
First	$	3,412	$	3,522	$	1,144	$	1,107
Second	3,465		3,461		1,197		1,186
Third	3,429		3,372		1,201		1,000
Fourth	3,464		3,223		1,185		1,088
	$	13,770	$	13,578	$	4,727	$	4,381

Schedule Of Quarterly Financial Data Net Income And Earnings Per Share [Table Text Block]

	Net income (loss) attributable to Kellogg Company				Per share amounts
(millions)	2020		2019		2020				2019
					Basic		Diluted		Basic		Diluted
First	$	347	$	282	$	1.01	$	1.01	$	0.82	$	0.82
Second	351		286		1.02		1.02		0.84		0.84
Third	348		247		1.02		1.01		0.73		0.72
Fourth	205		145		0.60		0.59		0.43		0.42
	$	1,251	$	960

Schedule Of Quarterly Financial Data Dividends Per Share And Stock Prices [Table Text Block]

Quarter	2020		2019
First	$	0.57	$	0.56
Second	0.57		0.56
Third	0.57		0.57
Fourth	0.57		0.57
	$	2.28	$	2.26

Schedule Of Quarterly Financial Data Charges Gain In Operating Profit [Table Text Block]

During 2020, the Company recorded the following in operating profit and other income (expense):

	2020
(millions)	First		Second		Third		Fourth		Full Year
Operating profit
Restructuring and cost reduction charges	$	(1)	$	(14)	$	—	$	(22)	$	(37)
Gains / (losses) on mark-to-market adjustments	26		(43)		10		(1)		(8)
Other income (expense)
Restructuring and cost reduction charges	$	—	$	—	$	—	$	8	$	8
Gains / (losses) on mark-to-market adjustments	(14)		(43)		(7)		(90)		$	(154)

During 2019, the Company recorded the following in operating profit and other income (expense):

	2019
(millions)	First		Second		Third		Fourth		Full Year
Operating profit
Restructuring and cost reduction charges	$	(8)	$	(65)	$	(18)	$	(27)	$	(118)
Gains / (losses) on mark-to-market adjustments	(42)		46		(11)		—		(7)
Other income (expense)
Restructuring and cost reduction charges	$	—	$	—	$	—	$	5	$	5
Gains / (losses) on mark-to-market adjustments	1		(11)		32		(120)		$	(98)