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Redeemable and Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Feb. 22, 2015
Feb. 23, 2014
May 25, 2014
May 27, 2012
Noncontrolling Interest [Line Items]        
Redeemable interest $ 801.5us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue   $ 984.1us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue  
Noncontrolling interests held by Sodiaal 407.9us-gaap_MinorityInterest   470.6us-gaap_MinorityInterest  
Yoplait SAS [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage in consolidated subsidiary 51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
     
Redeemable interest 801.5us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
    904.4us-gaap_RedeemableNoncontrollingInterestEquityOtherFairValue
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
Redeemable interest percentage held by Sodiaal 49.00%gis_RedeemableInterestPercentOwnership
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
     
Related Party Transaction, Amounts of Transaction 213.4us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
233.6us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ dei_LegalEntityAxis
= gis_YoplaitSasMember
   
Yoplait Marques SAS and Liberte Marques Sarl [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest percentage in consolidated subsidiary 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= gis_YoplaitMarquesSasAndLiberteMarquesSarlMember
     
Ownership interest percentage held by noncontrolling owners 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= gis_YoplaitMarquesSasAndLiberteMarquesSarlMember
     
Noncontrolling interests held by Sodiaal 281.4us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= gis_YoplaitMarquesSasAndLiberteMarquesSarlMember
     
General Mills Cereals Llc [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling Interest Holders Capital Account, General Mills Cereals, LLC $ 251.5gis_NoncontrollingInterestFairValueAmount
/ dei_LegalEntityAxis
= gis_GeneralMillsCerealsLlcMember
     
Preferred distributions variable rate three-month LIBOR      
The percentage points added to the floating preferred return rate to compute the variable rate on preferred distributions. 1.10%gis_PreferredDistributionsBasisSpreadOnVariableRate
/ dei_LegalEntityAxis
= gis_GeneralMillsCerealsLlcMember
     
Preferred return rate adjustment period 3 years