Quarterly Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	May 29, 2016	May 31, 2015	May 29, 2016	May 31, 2015	May 25, 2014
QUARTERLY DATA (UNAUDITED) [Abstract]
Effective income tax rate	19.20%		31.40%	33.30%	33.30%
Divestitures [Line Items]
Pre-tax gain (loss) on sale of business			$ 148.2	$ 0.0	$ 65.5
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets impairment			$ 0.0	260.0
Foreign earnings repatriated		$ 606.1		606.1
Discrete income tax charge related to foreign earnings repatriated		78.6		78.6
General Mills de Venezuela CA Subsidiary [Member]
Divestitures [Line Items]
Pre-tax gain (loss) on sale of business	$ (37.6)
General Mills Argentina S.A. Foodservice Business [Member]
Divestitures [Line Items]
Pre-tax gain (loss) on sale of business	$ (14.8)
Green Giant [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets impairment				260.0
United States [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets impairment				260.0
United States [Member] | Green Giant [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Indefinite-lived intangible assets impairment		$ 260.0		$ 260.0