Consolidated Statements of Total Equity - USD ($) shares in Millions, $ in Millions	Total	Parent [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Common Stock in Treasury [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
Beginning Balance, Treasury Stock, Shares at May. 28, 2023						(168.0)
Stockholders' Equity, Number of Shares
Shares purchased, including excise tax, shares	(18.8)					(18.8)
Stock compensation plans						1.1
Ending Balance, Treasury Stock, Shares at Nov. 26, 2023						(185.7)
Ending Balance, Common Stock, Shares, Issued at Nov. 26, 2023			754.6
Beginning Balance, equity at May. 28, 2023	$ 10,700.0			$ 1,222.4	$ 19,838.6	$ (8,410.0)	$ (2,276.9)	$ 250.4
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares purchased, including excise tax, value	(1,313.5)					(1,313.5)
Stock compensation plans				0.8		46.1
Unearned compensation related to stock unit awards				(79.9)
Earned compensation				58.5
Comprehensive income (loss)							(25.1)	14.0
Net earnings attributable to General Mills	1,269.0	$ 1,269.0			1,269.0
Distributions to noncontrolling interest holders								(12.0)
Change in ownership interest								0.7
Cash dividends declared ($0.60 and $0.59 per share)					(1,026.7)
Ending Balance, equity at Nov. 26, 2023	$ 9,631.9		$ 75.5	1,201.8	20,080.9	$ (9,677.4)	(2,302.0)	253.1
Beginning Balance, Treasury Stock, Shares at Aug. 27, 2023						(173.4)
Stockholders' Equity, Number of Shares
Shares purchased, including excise tax, shares	(12.4)					(12.4)
Stock compensation plans						0.1
Ending Balance, Treasury Stock, Shares at Nov. 26, 2023						(185.7)
Ending Balance, Common Stock, Shares, Issued at Nov. 26, 2023			754.6
Beginning Balance, equity at Aug. 27, 2023	$ 10,515.4			1,185.7	20,163.6	$ (8,874.3)	(2,288.1)	253.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares purchased, including excise tax, value	(808.8)					(808.8)
Stock compensation plans				(6.5)		5.7
Unearned compensation related to stock unit awards				(0.5)
Earned compensation				23.1
Comprehensive income (loss)							(13.9)	7.1
Net earnings attributable to General Mills	595.5	595.5			595.5
Distributions to noncontrolling interest holders								(7.7)
Change in ownership interest								0.7
Cash dividends declared ($0.60 and $0.59 per share)					(678.2)
Ending Balance, equity at Nov. 26, 2023	$ 9,631.9		$ 75.5	1,201.8	20,080.9	$ (9,677.4)	(2,302.0)	253.1
Beginning Balance, Common Stock, Shares, Issued at May. 26, 2024	754.6
Beginning Balance, Treasury Stock, Shares at May. 26, 2024	(195.5)					(195.5)
Stockholders' Equity, Number of Shares
Shares purchased, including excise tax, shares	(8.7)					(8.7)
Stock compensation plans						1.8
Ending Balance, Treasury Stock, Shares at Nov. 24, 2024	(202.4)					(202.4)
Ending Balance, Common Stock, Shares, Issued at Nov. 24, 2024	754.6		754.6
Beginning Balance, equity at May. 26, 2024	$ 9,648.5			1,227.0	20,971.8	$ (10,357.9)	(2,519.7)	251.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares purchased, including excise tax, value	(605.2)					(605.2)
Stock compensation plans				(9.3)		89.8
Unearned compensation related to stock unit awards				(81.7)
Earned compensation				46.0
Comprehensive income (loss)							(4.1)	9.5
Net earnings attributable to General Mills	1,375.6	1,375.6			1,375.6
Distributions to noncontrolling interest holders								(12.8)
Change in ownership interest								0.0
Cash dividends declared ($0.60 and $0.59 per share)					(1,007.1)
Ending Balance, equity at Nov. 24, 2024	$ 9,449.2		$ 75.5	1,182.0	21,340.3	$ (10,873.3)	(2,523.8)	248.5
Beginning Balance, Treasury Stock, Shares at Aug. 25, 2024						(198.8)
Stockholders' Equity, Number of Shares
Shares purchased, including excise tax, shares	(4.2)					(4.2)
Stock compensation plans						0.6
Ending Balance, Treasury Stock, Shares at Nov. 24, 2024	(202.4)					(202.4)
Ending Balance, Common Stock, Shares, Issued at Nov. 24, 2024	754.6		754.6
Beginning Balance, equity at Aug. 25, 2024	$ 9,526.6			1,164.6	21,213.9	$ (10,601.9)	(2,576.5)	251.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares purchased, including excise tax, value	(303.0)					(303.0)
Stock compensation plans				(4.1)		31.6
Unearned compensation related to stock unit awards				(4.6)
Earned compensation				26.1
Comprehensive income (loss)							52.7	5.3
Net earnings attributable to General Mills	795.7	$ 795.7			795.7
Distributions to noncontrolling interest holders								(7.8)
Change in ownership interest								0.0
Cash dividends declared ($0.60 and $0.59 per share)					(669.3)
Ending Balance, equity at Nov. 24, 2024	$ 9,449.2		$ 75.5	$ 1,182.0	$ 21,340.3	$ (10,873.3)	$ (2,523.8)	$ 248.5