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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	May 27, 2012	Feb. 26, 2012	Nov. 27, 2011	Aug. 28, 2011	May 29, 2011	Feb. 27, 2011	Nov. 28, 2010	Aug. 29, 2010	May 27, 2012	May 29, 2011	May 30, 2010
EARNINGS PER SHARE [Abstract]
Net earnings attributable to General Mills	$ 325.4	$ 391.5	$ 444.8	$ 405.6	$ 320.2	$ 392.1	$ 613.9	$ 472.1	$ 1,567.3	$ 1,798.3	$ 1,530.5
Earnings Per Share Diluted Other Disclosures Abstract
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount									5.8	4.8	6.3
Average number of common shares - basic EPS									648.1	642.7	659.6
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Stock options (a)									13.9	16.6	17.7
Restricted stock, restricted stock units, and other (a)									4.7	5.5	6.0
Average number of common shares - diluted EPS									666.7	664.8	683.3
Earnings per share - basic	$ 0.50	$ 0.61	$ 0.69	$ 0.63	$ 0.50	$ 0.61	$ 0.96	$ 0.73	$ 2.42	$ 2.80	$ 2.32
Earnings per share - diluted	$ 0.49	$ 0.58	$ 0.67	$ 0.61	$ 0.48	$ 0.59	$ 0.92	$ 0.70	$ 2.35	$ 2.70	$ 2.24