Goodwill and Other Intangible Assets - Intangible Assets Not Subject to Amortization (Details) $ in Millions	3 Months Ended
	Apr. 01, 2017 USD ($)
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	$ 2,282
Purchase price allocation adjustment	4
Currency translation adjustment	9
Intangible assets not subject to amortization, ending balance	2,295
U.S. Morning Foods
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0
Purchase price allocation adjustment	0
Currency translation adjustment	0
Intangible assets not subject to amortization, ending balance	0
U.S. Snacks
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	1,625
Purchase price allocation adjustment	0
Currency translation adjustment	0
Intangible assets not subject to amortization, ending balance	1,625
U.S. Specialty
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0
Purchase price allocation adjustment	0
Currency translation adjustment	0
Intangible assets not subject to amortization, ending balance	0
North America Other
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	176
Purchase price allocation adjustment	0
Currency translation adjustment	0
Intangible assets not subject to amortization, ending balance	176
Europe
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	383
Purchase price allocation adjustment	0
Currency translation adjustment	5
Intangible assets not subject to amortization, ending balance	388
Latin America
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	98
Purchase price allocation adjustment	4
Currency translation adjustment	4
Intangible assets not subject to amortization, ending balance	106
Asia Pacific
Indefinite-lived Intangible Assets [Roll Forward]
Intangible assets not subject to amortization, beginning balance	0
Purchase price allocation adjustment	0
Currency translation adjustment	0
Intangible assets not subject to amortization, ending balance	$ 0