Reportable Segments (Reportable Segment Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Segment Reporting Information [Line Items]
Net sales	$ 3,685	$ 3,714	$ 7,427	$ 7,575
Operating profit	467	570	1,081	1,073
Reportable segments information			The Company currently manages its operations through eight operating segments that are based on product category or geographic location. These operating segments are evaluated for similarity with regards to economic characteristics, products, production processes, types or classes of customers, distribution methods and regulatory environments to determine if they can be aggregated into reportable segments.  The reportable segments are discussed in greater detail below.
Number of operating segments			8
Number of reportable segments			3
U.S. Morning Foods [Member]
Segment Reporting Information [Line Items]
Net sales	820	863	1,681	1,774
Operating profit	143	180	271	343
Reportable segments information			U.S. Morning Foods includes cereal, toaster pastries, health and wellness bars, and beverages.
U.S. Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	893	917	1,796	1,818
Operating profit	130	130	225	236
Reportable segments information			U.S. Snacks includes products such as cookies, crackers, cereal bars, savory snacks and fruit-flavored snacks.
U.S. Specialty [Member]
Segment Reporting Information [Line Items]
Net sales	276	272	648	651
Operating profit	63	62	150	140
Reportable segments information			U.S. Specialty includes the food service, convenience and Girl Scouts businesses. The food service business is mostly non-commercial, servicing institutions such as schools and hospitals.
North America Other [Member]
Segment Reporting Information [Line Items]
Net sales	361	388	742	791
Operating profit	62	78	134	153
Reportable segments information			North America Other includes the U.S. Frozen and Canada operating segments.  As these operating segments are not considered economically similar enough to aggregate with other operating segments and are immaterial for separate disclosure, they have been grouped together as a single reportable segment.
Total Reportable Segments [Member]
Segment Reporting Information [Line Items]
Operating profit	500	584	1,011	1,146
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	772	723	1,480	1,415
Operating profit	53	75	120	146
Reportable segments information			Europe, which consists principally of European countries;
Latin America [Member]
Segment Reporting Information [Line Items]
Net sales	320	304	598	612
Operating profit	47	42	95	90
Reportable segments information			Latin America, which is comprised of Central and South America and includes Mexico;
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	243	247	482	514
Operating profit	2	17	16	38
Reportable segments information			Asia Pacific, which is comprised of South Africa, Australia and other Asian and Pacific markets.
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit	$ (33)	$ (14)	$ 70	$ (73)