Consolidated Statements of Total Equity and Redeemable Interest - USD ($) shares in Millions, $ in Millions	3 Months Ended				12 Months Ended
	May 28, 2023	Aug. 28, 2022	May 29, 2022	Aug. 29, 2021	May 28, 2023	May 29, 2022	May 30, 2021
Stockholders' Equity, Number of Shares
Beginning Balance, Common Stock, Shares, Issued		754.6		754.6	754.6	754.6
Beginning Balance, Treasury Stock, Shares		(155.7)			(155.7)
Shares purchased, shares					(18.0)	(13.5)	(5.0)
Ending Balance, Treasury Stock, Shares	(168.0)		(155.7)		(168.0)	(155.7)
Ending Balance, Common Stock, Shares, Issued	754.6		754.6		754.6	754.6	754.6
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		$ 10,788.0		$ 9,773.2	$ 10,788.0	$ 9,773.2	$ 8,349.5
Net earnings attributable to General Mills	$ 614.9	820.0	$ 822.8	627.0	2,593.9	2,707.3	2,339.8
Shares purchased, value					(1,403.6)	(876.8)	(301.4)
Ending Balance, equity	10,700.0		10,788.0		10,700.0	10,788.0	9,773.2
Redeemable Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Decrease in redemption value of redeemable interest					0.0	(14.1)	(0.2)
Distributions to redeemable interest holder					0.0	0.0	(22.7)
Reclassification to noncontrolling interest					0.0	(561.6)	0.0
Redeemable Interest
Beginning Balance, Redeemable Noncontrolling Interest, Equity, Other, Fair Value		0.0		604.9	0.0	604.9	544.6
Total comprehensive income (loss) attributable to redeemable interests					0.0	(29.2)	83.2
Decrease in redemption value of redeemable interest					0.0	(14.1)	(0.2)
Distributions to redeemable interest holder					0.0	0.0	(22.7)
Ending Balance, Redeemable Noncontrolling Interest, Equity, Other, Fair Value	0.0		0.0		0.0	0.0	604.9
Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net earnings attributable to General Mills					2,593.9	2,707.3	2,339.8
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares issued, value					75.5	75.5	75.5
Additional Paid-In Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		1,182.9		1,365.5	1,182.9	1,365.5	1,348.6
Stock compensation plans					34.5	17.9	6.2
Unearned compensation related to stock unit awards					(104.7)	(92.2)	(78.0)
Earned compensation					109.7	104.5	88.5
Decrease in redemption value of redeemable interest					0.0	14.1	0.2
Reversal of Cumulative Redeemable Interest Value Adjustments					0.0	(207.4)	0.0
Acquisition of noncontrolling interest					0.0	(19.5)	0.0
Ending Balance, equity	1,222.4		1,182.9		1,222.4	1,182.9	1,365.5
Redeemable Interest
Decrease in redemption value of redeemable interest					0.0	14.1	0.2
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		$ 18,532.6		17,069.8	18,532.6	17,069.8	15,982.1
Net earnings attributable to General Mills					2,593.9	2,707.3	2,339.8
Cash dividends declared ($2.16, $2.04 and $2.02 per share)					(1,287.9)	(1,244.5)	(1,246.4)
Ending Balance, equity	19,838.6		$ 18,532.6		19,838.6	18,532.6	17,069.8
Retained Earnings [Member] | Cumulative Effect Period Of Adoption [Member] | Accounting Standards Update 2016-13 [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity				$ 0.0		$ 0.0	(5.7)
Ending Balance, equity	$ 0.0				$ 0.0		$ 0.0
Treasury Stock Common [Member]
Stockholders' Equity, Number of Shares
Beginning Balance, Treasury Stock, Shares		(155.7)		(146.9)	(155.7)	(146.9)	(144.8)
Shares purchased, shares					(18.0)	(13.5)	(5.0)
Stock compensation plans					5.7	4.7	2.9
Ending Balance, Treasury Stock, Shares	(168.0)		(155.7)		(168.0)	(155.7)	(146.9)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		$ (7,278.1)		$ (6,611.2)	$ (7,278.1)	$ (6,611.2)	$ (6,433.3)
Stock compensation plans					271.7	209.9	123.5
Shares purchased, value					(1,403.6)	(876.8)	(301.4)
Ending Balance, equity	$ (8,410.0)		$ (7,278.1)		(8,410.0)	(7,278.1)	(6,611.2)
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		(1,970.5)		(2,429.2)	(1,970.5)	(2,429.2)	(2,914.4)
Comprehensive income (loss)					(306.4)	458.7	485.2
Ending Balance, equity	(2,276.9)		(1,970.5)		(2,276.9)	(1,970.5)	(2,429.2)
Noncontrolling Interests [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning Balance, equity		$ 245.6		$ 302.8	245.6	302.8	291.0
Comprehensive income (loss)					15.4	(16.0)	38.0
Reclassification from Redeemable Interest					0.0	561.6	0.0
Reversal of Cumulative Redeemable Interest Value Adjustments					0.0	207.4	0.0
Divestiture					5.1	(680.4)	0.0
Distributions to redeemable interest holder					(15.7)	(129.8)	(26.2)
Ending Balance, equity	$ 250.4		$ 245.6		250.4	245.6	302.8
Redeemable Interest
Distributions to redeemable interest holder					$ (15.7)	$ (129.8)	$ (26.2)