Leases (Narrative) (Details) $ in Millions	May 26, 2024 USD ($)
Leases [Abstract]
Lessee Operating Lease Signed Not Yet Commenced Amount	$ 126.2

Minimum lease payments for operating leases committed to but not yet commenced.

No definition available.

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