The amount of cash outflow related to a debt exchange participation incentive.

No definition available.

Name:	gis_DebtExchangeParticipationIncentiveCashPayment
Namespace Prefix:	gis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the minimum fixed charge coverage ratio required to be maintained under certain credit facilities.

+ References

No definition available.

+ Details

Name:	gis_DebtInstrumentCovenantMinimumFixedChargeCoverageRatio
Namespace Prefix:	gis_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

+ Details

Name:	us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansPayableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

+ Details

Name:	us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=gis_LineOfCreditExpiringApril2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_EuroDenominatedFloatingRateNotesDueNovember102023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FloatingRateNotesDueMay162023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_EuroDenominated391NotesDueApril132029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FixedRateNotesDueApril132023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_NotesDueMarch292033Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_NotesDueNovember182025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FixedRateNotesDueNovember112022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_NotesDueOctober122022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FixedRateNotesDueOctober172023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_EuroDenominatedNotesDueNovember2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_ZeroPointZeroZeroZeroFixedRateNotes3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_NotesDueOctober142031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FixedRateNotesDueDecember152021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FloatingRateNotesDueJuly272023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_EuroDenominatedNotesDueAugust212021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_TwoTwoPercentNotesDueJune2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_FixedRateNotesDueNovember292021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=gis_CertainLongTermDebtAgreementsContainingRestrictiveCovenantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Narrative) (Details) € in Millions, $ in Millions	3 Months Ended									12 Months Ended
Debt (Narrative) (Details) € in Millions, $ in Millions	May 28, 2023 USD ($)	May 28, 2023 EUR (€)	Nov. 27, 2022 USD ($)	Nov. 27, 2022 EUR (€)	May 29, 2022 USD ($)	May 29, 2022 EUR (€)	Nov. 28, 2021 USD ($)	Nov. 28, 2021 EUR (€)	Aug. 29, 2021 EUR (€)	May 28, 2023 USD ($)	May 29, 2022 USD ($)	May 30, 2021 USD ($)
Debt Instrument [Line Items]
Long-term debt, fair value	$ 10,929.6				$ 10,508.8					$ 10,929.6	$ 10,508.8
Long-term debt, carrying value	11,674.2				$ 10,809.0					11,674.2	10,809.0
Issuance of long-term debt										2,324.4	2,203.7	$ 1,576.5
Repayment of long-term debt										1,421.7	3,140.9	2,609.0
Facility Amount	3.3									3.3
Debt exchange participation incentive cash payment										0.0	$ 0.0	$ 201.4
Pre-tax hedge gain (loss) in AOCI										(11.2)
Pre-tax gain to be reclassified from AOCI to net interest during next fiscal year	$ 0.7									$ 0.7
Committed Credit Facilities [Member]
Debt Instrument [Line Items]
Minimum fixed charge coverage ratio	2.5									2.5
Line Of Credit Expiring April 2026 [Member]
Debt Instrument [Line Items]
Facility Amount	$ 2.7									$ 2.7
Floating Euro-denominated floating rate notes due November 10, 2023 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €		€ 250
Maturity date										Nov. 10, 2023
Floating-rate notes due May 16, 2023 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €				€ 250				€ 250
Repayment of long-term debt \| €		€ 250
Fixed interest rate percentage	0.00%									0.00%
Maturity date	May 16, 2023	May 16, 2023	May 16, 2023	May 16, 2023			May 16, 2023	May 16, 2023		May 16, 2023
Euro-denominated 3.907% notes due April 13, 2029 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €		€ 750
Fixed interest rate percentage	3.907%									3.907%
Maturity date										Apr. 13, 2029
1.0 percent fixed-rate notes due April 13, 2023 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt \| €		€ 500
Fixed interest rate percentage	1.00%									1.00%
Maturity date										Apr. 27, 2023
4.95% notes due March 29, 2033 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt	$ 1,000.0
Fixed interest rate percentage	4.95%									4.95%
Maturity date										Mar. 29, 2033
5.241% notes due November 18, 2025 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt			$ 500.0
Fixed interest rate percentage	5.241%		5.241%	5.241%						5.241%
Maturity date			Nov. 18, 2025	Nov. 18, 2025						Nov. 18, 2025
0.0 percent fixed-rate notes due November 11, 2022 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €						€ 250
Repayment of long-term debt \| €				€ 250
Fixed interest rate percentage	0.00%		0.00%	0.00%						0.00%
Maturity date			Nov. 11, 2022	Nov. 11, 2022	Nov. 11, 2022	Nov. 11, 2022
2.6% notes due October 12, 2022 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt			$ 500.0
Fixed interest rate percentage	2.60%		2.60%	2.60%						2.60%
Maturity date			Oct. 12, 2022	Oct. 12, 2022						Oct. 12, 2022
3.7 percent fixed-rate notes due October 17, 2023 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt					$ 850.0
Fixed interest rate percentage					3.70%						3.70%
Maturity date					Oct. 17, 2023	Oct. 17, 2023
0.125% notes due November 15, 2025 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €								€ 500
Fixed interest rate percentage	0.125%						0.125%	0.125%		0.125%
Maturity date							Nov. 15, 2025	Nov. 15, 2025		Nov. 15, 2025
0.00% Fixed Rate Notes Due Nov. 16 2021 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt \| €								€ 500
Fixed interest rate percentage							0.00%	0.00%
Maturity date							Nov. 16, 2021	Nov. 16, 2021
2.25 percent notes due October 14, 2031 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt							$ 500.0
Fixed interest rate percentage	2.25%						2.25%	2.25%		2.25%
Maturity date							Oct. 14, 2031	Oct. 14, 2031
Pre-tax hedge gain (loss) in AOCI										$ 16.5
3.15 percent fixed-rate notes due December 15, 2021 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt							$ 1,000.0
Fixed interest rate percentage							3.15%	3.15%
Maturity date							Dec. 15, 2021	Dec. 15, 2021
Floating-rate notes due July 27, 2023 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €									€ 500
Maturity date									Jul. 27, 2023
Euro-denominated 0% notes due August 21, 2021 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt \| €									€ 500
Fixed interest rate percentage									0.00%
Maturity date									Aug. 21, 2021
Euro-denominated 2.2% notes due June 24, 2021 [Member]
Debt Instrument [Line Items]
Repayment of long-term debt \| €									€ 200
Fixed interest rate percentage									2.20%
Maturity date									Jun. 24, 2021	Nov. 10, 2023
2.2 percent fixed-rate notes due November 29, 2021 [Member]
Debt Instrument [Line Items]
Issuance of long-term debt \| €									€ 50
Fixed interest rate percentage									2.20%
Maturity date									Nov. 29, 2021
Certain Long Term Debt Agreements Containing Restrictive Covenants [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance										As of May 28, 2023, we were in compliance with all of these covenants.