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Stock Plans (Schedule of compensation expense related to stock-based payments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2022	Nov. 28, 2021	Nov. 27, 2022	Nov. 28, 2021
Stock Plans [Abstract]
Compensation expense related to stock-based payments	$ 24.1	$ 13.9	$ 57.6	$ 47.5

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees, including any applicable restructuring items and non-cash items.

+ References

No definition available.

+ Details

Name:	gis_AllocatedShareBasedCompensationExpenseIncludingRestructuringAndNoncashItems
Namespace Prefix:	gis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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