Acquisitions, West Africa Investments, Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 29, 2018 USD ($)
Change in carrying amount of goodwill
Beginning Balance	$ 5,504
Additions	616
Purchase price allocation adjustment	(5)
Purchase price adjustment	(1)
Currency translation adjustment	(59)
Ending Balance	6,055
U.S. Snacks
Change in carrying amount of goodwill
Beginning Balance	3,568
Additions	0
Purchase price allocation adjustment	0
Purchase price adjustment	0
Currency translation adjustment	0
Ending Balance	3,568
U.S. Morning Foods
Change in carrying amount of goodwill
Beginning Balance	131
Additions	0
Purchase price allocation adjustment	0
Purchase price adjustment	0
Currency translation adjustment	0
Ending Balance	131
U.S. Specialty Channels
Change in carrying amount of goodwill
Beginning Balance	82
Additions	0
Purchase price allocation adjustment	0
Purchase price adjustment	0
Currency translation adjustment	0
Ending Balance	82
North America Other
Change in carrying amount of goodwill
Beginning Balance	836
Additions	0
Purchase price allocation adjustment	(1)
Purchase price adjustment	(1)
Currency translation adjustment	(1)
Ending Balance	833
Europe
Change in carrying amount of goodwill
Beginning Balance	414
Additions	0
Purchase price allocation adjustment	0
Purchase price adjustment	0
Currency translation adjustment	(15)
Ending Balance	399
Latin America
Change in carrying amount of goodwill
Beginning Balance	244
Additions	0
Purchase price allocation adjustment	0
Purchase price adjustment	0
Currency translation adjustment	(30)
Ending Balance	214
Asia Pacific
Change in carrying amount of goodwill
Beginning Balance	229
Additions	616
Purchase price allocation adjustment	(4)
Purchase price adjustment	0
Currency translation adjustment	(13)
Ending Balance	$ 828