Goodwill and Other Intangible Assets Intangible Assets Not Subject to Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	$ 2,199	$ 2,206
Additions	113	36
Contribution to joint venture	(5)
Currency translation adjustment	(25)	(43)
Intangible assets not subject to amortization, ending balance	2,282	2,199
U.S. Morning Foods
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	0	0
Contribution to joint venture	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	0	0
U.S. Snacks
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	1,625	1,625
Additions	0	0
Contribution to joint venture	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	1,625	1,625
U.S. Specialty
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	0	0
Contribution to joint venture	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	0	0
North America Other
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	158	158
Additions	18	0
Contribution to joint venture	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	176	158
Europe
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	416	423
Additions	3	36
Contribution to joint venture	(5)
Currency translation adjustment	(31)	(43)
Intangible assets not subject to amortization, ending balance	383	416
Latin America
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	92	0
Contribution to joint venture	0
Currency translation adjustment	6	0
Intangible assets not subject to amortization, ending balance	98	0
Asia Pacific
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	0	0
Contribution to joint venture	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	$ 0	$ 0