Consolidated Statement of Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total		Common stock	Capital in excess of par value	Retained earnings	Treasury stock	Accumulated other comprehensive income (loss)	Total Kellogg Company equity	Non- controlling interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,851								$ 62
Balance at Jan. 03, 2015			$ 105	$ 678	$ 6,689	$ (3,470)	$ (1,213)	$ 2,789
Balance (in shares) at Jan. 03, 2015			420			64
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases (in shares)						11
Common stock repurchases	(731)					$ (731)		(731)
VIE deconsolidation	(58)								$ (58)
Net income	614				614			614
Noncontrolling Interest, Increase from Business Combination	7								$ 7
Dividends	(700)				(700)			(700)
Other comprehensive loss	(164)						(163)	(163)	$ (1)
Stock compensation	51			51				51
Stock options exercised and other (in shares)						(5)
Stock options exercised and other	268			16	(6)	$ 258		268
Balance (in shares) at Jan. 02, 2016			420			70
Balance at Jan. 02, 2016	2,128	[1]	$ 105	745	6,597	$ (3,943)	(1,376)	2,128
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,138	[1]							$ 10
Common stock repurchases (in shares)	3					3
Common stock repurchases	$ (210)					$ (210)		(210)
Net income	175				175			175
Dividends	(176)				(176)			(176)
Other comprehensive loss	(58)						(58)	(58)
Stock compensation	15			15				15
Stock options exercised and other (in shares)						(3)
Stock options exercised and other	157			(6)	(1)	$ 164		157
Balance (in shares) at Apr. 02, 2016			420			70
Balance at Apr. 02, 2016	2,031		$ 105	$ 754	$ 6,595	$ (3,989)	$ (1,434)	$ 2,031
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,041								$ 10

[1] Condensed from audited financial statements.