Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Income Statement [Abstract]
Net sales	$ 3,395	$ 3,556
Cost of goods sold	2,150	2,311
Selling, general and administrative expense	807	861
Operating profit	438	384
Interest expense	217	54
Other income (expense), net	0	(26)
Income before income taxes	221	304
Income taxes	47	76
Earnings (loss) from unconsolidated entities	1	(1)
Net income	175	227
Net income (loss) attributable to noncontrolling interests	0	0
Net income attributable to Kellogg Company	$ 175	$ 227
Per share amounts:
Basic (in dollars per share)	$ 0.50	$ 0.64
Diluted (in dollars per share)	0.49	0.64
Dividends per share (in dollars per share)	$ 0.50	$ 0.49
Average shares outstanding:
Basic (in shares)	351	355
Diluted (in shares)	355	357
Actual shares outstanding at period end (in shares)	350	353