Discontinued Operations (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		4 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Snacks Business Segment [Member]	Dec. 31, 2011 Snacks Business Segment [Member]	Dec. 31, 2012 Snacks Business Segment [Member]	Dec. 31, 2011 Snacks Business Segment [Member]	May 31, 2012 The Kellogg Company [Member]	Jun. 30, 2012 The Kellogg Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disontinued Operations, Agreed Upon Sale Price									$ 2,700,000,000
Disposal Group, Not Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales					0	392,000,000	0	777,000,000
Earnings from discontinued operations before income taxes					0	59,000,000	0	143,000,000
Income tax expense					0	18,000,000	0	44,000,000
Net earnings from discontinued operations	$ 0	$ 41,000,000	$ 0	$ 99,000,000	$ 0	$ 41,000,000	$ 0	$ 99,000,000		$ 1,400,000,000