Name:	gis_NoncontrollingInterestFairValueAmount
Namespace Prefix:	gis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Identification of whether the entity has been in compliance with any noncontrolling interest covenants during the period.

No definition available.

Name:	gis_NoncontrollingInterestsCovenantCompliancee
Namespace Prefix:	gis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The percentage points added to the floating preferred return rate to compute the variable rate on preferred distributions.

No definition available.

Name:	gis_PreferredDistributionsBasisSpreadOnVariableRate
Namespace Prefix:	gis_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

The reference rate for the variable rate of the preferred distributions, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

No definition available.

Name:	gis_PreferredDistributionsDescriptionOfVariableRate
Namespace Prefix:	gis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The time period between scheduled adjustments of the preferred return rate.

No definition available.

Name:	gis_PreferredReturnRateAdjustmentPeriod
Namespace Prefix:	gis_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The percent ownership as of the reporting date of noncontrolling interests which the parent entity is required to redeem (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity.

No definition available.

Name:	gis_RedeemableInterestPercentOwnership
Namespace Prefix:	gis_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RedeemableNoncontrollingInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

No definition available.

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	srt_OwnershipAxis=gis_YoplaitSasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_OwnershipAxis=gis_GeneralMillsCerealsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_PreferredClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gis_ThirdPartyInterestHolderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementEquityComponentsAxis=gis_RedeemableInterestsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: