Goodwill and Other Intangible Assets Intangible Assets Not Subject to Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	$ 2,282	$ 2,199
Additions	184	113
Contribution to joint venture		(5)
Purchase price allocation adjustments	(11)
Currency translation adjustment	50	(25)
Intangible assets not subject to amortization, ending balance	2,505	2,282
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
Purchase price allocation adjustments	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
Purchase price allocation adjustments	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
Purchase price allocation adjustments	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	176	158
Additions	184	18
Contribution to joint venture		0
Purchase price allocation adjustments	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	360	176
Europe
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	383	416
Additions	0	3
Contribution to joint venture		(5)
Purchase price allocation adjustments	0
Currency translation adjustment	51	(31)
Intangible assets not subject to amortization, ending balance	434	383
Latin America
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	98	0
Additions	0	92
Contribution to joint venture		0
Purchase price allocation adjustments	(11)
Currency translation adjustment	(1)	6
Intangible assets not subject to amortization, ending balance	86	98
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
Purchase price allocation adjustments	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	$ 0	$ 0