Statement of Shareholders' Equity - 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	Total comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent							$ 2,404
Balance, in shares at Dec. 29, 2012		420			58
Balance at Dec. 29, 2012	$ 2,465	$ 105	$ 573	$ 5,615	$ (2,943)	$ (946)		$ 61	$ 1,021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchases (in shares)	9				9
Common stock repurchases	$ (544)				$ (544)		(544)
Net income	1,808			1,807			1,807	1	1,808
Dividends	(653)			(653)			(653)
Other comprehensive income (loss)	10					10	10		10
Stock compensation	28		28				28
Stock options exercised and other (in shares)					(10)
Stock options exercised and other	493		25	(20)	$ 488		493
Balance, in shares at Dec. 28, 2013		420			57
Balance at Dec. 28, 2013	$ 3,607	$ 105	626	6,749	$ (2,999)	(936)		62	1,818
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent							3,545
Common stock repurchases (in shares)	11				11
Common stock repurchases	$ (690)				$ (690)		(690)
Net income	633			632			632	1	633
Dividends	(681)			(680)			(680)	(1)
Other comprehensive income (loss)	(277)					(277)	(277)		(277)
Stock compensation	29		29				29
Stock options exercised and other (in shares)					(4)
Stock options exercised and other	230		23	(12)	$ 219		230
Balance, in shares at Jan. 03, 2015		420			64
Balance at Jan. 03, 2015	2,851	$ 105	678	6,689	$ (3,470)	(1,213)		62	356
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent	$ 2,789						2,789
Common stock repurchases (in shares)	11				11
Common stock repurchases	$ (731)				$ (731)		(731)
Acquisition of noncontrolling interest	7							7
VIE deconsolidation	(58)							$ (58)
Net income	614			614			614		614
Dividends	(700)			(700)			(700)
Other comprehensive income (loss)	(164)					(163)	(163)	$ (1)	(164)
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	2,138	$ 105	$ 745	$ 6,597	$ (3,943)	$ (1,376)		$ 10	$ 450
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent	$ 2,128						$ 2,128