Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		4 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Snacks Business Segment [Member]	Mar. 31, 2012 Snacks Business Segment [Member]	Mar. 31, 2013 Snacks Business Segment [Member]	Mar. 31, 2012 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	350,000,000	0	1,128,000,000
Earnings from discontinued operations before income taxes					0	56,000,000	0	199,000,000
Income tax expense					0	22,000,000	0	66,000,000
Net earnings from discontinued operations	$ 0	$ 34,000,000	$ 0	$ 133,000,000	$ 0	$ 34,000,000	$ 0	$ 133,000,000		$ 1,400,000,000