Acquisitions, Goodwill and Other Intangible Assets (Intangible Assets not Subject to Amortization) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	$ 2,265	$ 2,249
Currency translation adjustment	(59)	16
Ending balance	2,206	2,265
U.S. Morning Foods [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	63	63
Currency translation adjustment	0	0
Ending balance	63	63
U.S. Snacks [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	1,625	1,625
Currency translation adjustment	0	0
Ending balance	1,625	1,625
U.S. Specialty [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	0	0
Currency translation adjustment	0	0
Ending balance	0	0
North America Other [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	95	95
Currency translation adjustment	0	0
Ending balance	95	95
Europe [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	482	466
Currency translation adjustment	(59)	16
Ending balance	423	482
Latin America [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	0	0
Currency translation adjustment	0	0
Ending balance	0	0
Asia Pacific [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Beginning balance	0	0
Currency translation adjustment	0	0
Ending balance	$ 0	$ 0