Acquisitions, Goodwill and Other Intangible Assets (Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Change in carrying amount of goodwill
Beginning Balance	$ 3,623	[1]
Pringles goodwill	1,419
Currency translation adjustment	2
Ending Balance	5,044
U.S. Morning Foods and Kashi [Member]
Change in carrying amount of goodwill
Beginning Balance	80
Pringles goodwill	147
Currency translation adjustment	0
Ending Balance	227
U.S. Snacks [Member]
Change in carrying amount of goodwill
Beginning Balance	3,257
Pringles goodwill	466
Currency translation adjustment	0
Ending Balance	3,723
U.S. Specialty [Member]
Change in carrying amount of goodwill
Beginning Balance	0
Pringles goodwill	43
Currency translation adjustment	0
Ending Balance	43
North America Other [Member]
Change in carrying amount of goodwill
Beginning Balance	202
Pringles goodwill	57
Currency translation adjustment	0
Ending Balance	259
Europe [Member]
Change in carrying amount of goodwill
Beginning Balance	57
Pringles goodwill	478
Currency translation adjustment	2
Ending Balance	537
Latin America [Member]
Change in carrying amount of goodwill
Beginning Balance	0
Pringles goodwill	75
Currency translation adjustment	0
Ending Balance	75
Asia Pacific [Member]
Change in carrying amount of goodwill
Beginning Balance	27
Pringles goodwill	153
Currency translation adjustment	0
Ending Balance	$ 180

[1] * Condensed from audited financial statements.