Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets Intangible Assets Not Subject to Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	$ 2,505	$ 2,282
Additions	373	184
Purchase price allocation adjustments	0	(11)
Currency translation adjustment	(38)	50
Intangible assets not subject to amortization, ending balance	2,840	2,505
U.S. Snacks
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	1,625	1,625
Additions	0	0
Purchase price allocation adjustments	0	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	1,625	1,625
U.S. Morning Foods
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	0	0
Purchase price allocation adjustments	0	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	0	0
U.S. Specialty
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	0	0
Purchase price allocation adjustments	0	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	360	176
Additions	0	184
Purchase price allocation adjustments	0	0
Currency translation adjustment	0	0
Intangible assets not subject to amortization, ending balance	360	360
Europe
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	434	383
Additions	0	0
Purchase price allocation adjustments	0	0
Currency translation adjustment	(19)	51
Intangible assets not subject to amortization, ending balance	415	434
Latin America
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	86	98
Additions	0	0
Purchase price allocation adjustments	0	(11)
Currency translation adjustment	(13)	(1)
Intangible assets not subject to amortization, ending balance	73	86
Asia Pacific
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0	0
Additions	373	0
Purchase price allocation adjustments	0	0
Currency translation adjustment	(6)	0
Intangible assets not subject to amortization, ending balance	$ 367	$ 0