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Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of other intangible assets) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 0 Months Ended
Nov. 23, 2014
Nov. 26, 2013
Intangible Assets, Net [Line Items]    
Beginning balance - carrying value $ 5,014.3us-gaap_IntangibleAssetsNetExcludingGoodwill  
Acquisition 268.4us-gaap_IndefinitelivedIntangibleAssetsAcquired  
Amortization and foreign currency translation (154.8)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments  
Ending balance - carrying value 5,127.9us-gaap_IntangibleAssetsNetExcludingGoodwill  
Uncle Toby's Brand [Member]    
Intangible Assets, Net [Line Items]    
Ending balance - carrying value   63.0us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= gis_UncleTobysBrandMember
Fair Value in Excess of Carrying Value, Percentage of Intangible Assets   8.00%gis_FairValueInExcessOfCarryingValuePercentageOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= gis_UncleTobysBrandMember
Mountain High Brand [Member]    
Intangible Assets, Net [Line Items]    
Ending balance - carrying value   35.0us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= gis_MountainHighBrandMember
Fair Value in Excess of Carrying Value, Percentage of Intangible Assets   23.00%gis_FairValueInExcessOfCarryingValuePercentageOfIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= gis_MountainHighBrandMember
U.S. Retail [Member]    
Intangible Assets, Net [Line Items]    
Beginning balance - carrying value 3,307.5us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Acquisition 268.4us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Amortization and foreign currency translation (2.2)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Ending balance - carrying value 3,573.7us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
International [Member]    
Intangible Assets, Net [Line Items]    
Beginning balance - carrying value 1,641.8us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gis_InternationalMember
 
Acquisition 0us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= gis_InternationalMember
 
Amortization and foreign currency translation (152.9)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= gis_InternationalMember
 
Ending balance - carrying value 1,488.9us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gis_InternationalMember
 
Joint Ventures [Member]    
Intangible Assets, Net [Line Items]    
Beginning balance - carrying value 65.0us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gis_JointVenturesMember
 
Acquisition 0us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= gis_JointVenturesMember
 
Amortization and foreign currency translation 0.3us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= gis_JointVenturesMember
 
Ending balance - carrying value $ 65.3us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= gis_JointVenturesMember