Stockholders' Equity (Schedule of Total Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended								12 Months Ended
	May 28, 2023	Feb. 26, 2023	Nov. 27, 2022	Aug. 28, 2022	May 29, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	May 28, 2023	May 29, 2022	May 30, 2021
Reclassification to earnings:
Foreign currency translation									$ (7,400,000)	$ 342,200,000	$ 0
Other comprehensive (loss) income, net of tax:
Foreign currency translation									(110,800,000)	(175,900,000)	175,100,000
Net actuarial gain (loss)									(228,000,000.0)	101,600,000	353,400,000
Other fair value changes:
Hedge derivatives									1,300,000	7,000,000.0	(20,700,000)
Reclassification to earnings:
Hedge derivatives									(18,700,000)	35,100,000	13,500,000
Amortization of losses and prior service costs									56,900,000	75,800,000	78,900,000
Other comprehensive income (loss), net of tax									(306,700,000)	385,800,000	600,200,000
Comprehensive Income:
Net earnings attributable to General Mills	$ 614,900,000	$ 553,100,000	$ 605,900,000	$ 820,000,000.0	$ 822,800,000	$ 660,300,000	$ 597,200,000	$ 627,000,000.0	2,593,900,000	2,707,300,000	2,339,800,000
Net earnings attributable to redeemable and noncontrolling interests									15,700,000	27,700,000	6,200,000
Total comprehensive income (loss) attributable to General Mills									2,287,500,000	3,166,000,000.0	2,825,000,000.0
General Mills [Member]
Other comprehensive income (loss), before tax:
Foreign currency translation									(110,200,000)	(188,500,000)	(6,100,000)
Net actuarial gain (loss)									(295,500,000)	132,400,000	464,900,000
Other fair value changes:
Hedge derivatives									3,800,000	30,100,000	(25,800,000)
Reclassification to earnings:
Foreign currency translation									(7,400,000)	(342,200,000)
Hedge derivatives									(24,700,000)	23,700,000	19,100,000
Amortization of losses and prior service costs									72,900,000	97,400,000	102,500,000
Other comprehensive income (loss), before tax									(361,100,000)	437,300,000	554,600,000
Other comprehensive income (loss), tax:
Foreign currency translation									(300,000)	85,800,000	64,900,000
Net actuarial gain (loss)									67,500,000	(30,800,000)	(111,500,000)
Other fair value changes:
Hedge derivatives									(2,500,000)	(23,600,000)	6,500,000
Reclassification to earnings:
Foreign currency translation									0	0
Hedge derivatives									6,000,000.0	11,600,000	(5,700,000)
Amortization of losses and prior service costs									(16,000,000.0)	(21,600,000)	(23,600,000)
Other comprehensive income (loss), tax									54,700,000	21,400,000	(69,400,000)
Other comprehensive (loss) income, net of tax:
Foreign currency translation									(110,500,000)	(102,700,000)	58,800,000
Net actuarial gain (loss)									(228,000,000.0)	101,600,000	353,400,000
Other fair value changes:
Hedge derivatives									1,300,000	6,500,000	(19,300,000)
Reclassification to earnings:
Foreign currency translation									(7,400,000)	(342,200,000)
Hedge derivatives									(18,700,000)	35,300,000	13,400,000
Amortization of losses and prior service costs									56,900,000	75,800,000	78,900,000
Other comprehensive income (loss), net of tax									(306,400,000)	458,700,000	485,200,000
Comprehensive Income:
Net earnings attributable to General Mills									2,593,900,000	2,707,300,000	2,339,800,000
Total comprehensive income (loss) attributable to General Mills									2,287,500,000	3,166,000,000.0	2,825,000,000.0
Noncontrolling Interests [Member]
Other comprehensive (loss) income, net of tax:
Foreign currency translation									(300,000)	(26,200,000)	31,500,000
Net actuarial gain (loss)									0	0	0
Other fair value changes:
Hedge derivatives									0	0	0
Reclassification to earnings:
Foreign currency translation									0	0
Hedge derivatives									0	0	0
Amortization of losses and prior service costs									0	0	0
Other comprehensive income (loss), net of tax									(300,000)	(26,200,000)	31,500,000
Comprehensive Income:
Net earnings attributable to redeemable and noncontrolling interests									15,700,000	10,200,000	6,500,000
Total comprehensive income (loss) attributable to noncontrolling interests									$ 15,400,000	(16,000,000.0)	38,000,000.0
Redeemable Interest [Member]
Other comprehensive (loss) income, net of tax:
Foreign currency translation										(47,000,000.0)	84,800,000
Net actuarial gain (loss)										0	0
Other fair value changes:
Hedge derivatives										500,000	(1,400,000)
Reclassification to earnings:
Foreign currency translation										0
Hedge derivatives										(200,000)	100,000
Amortization of losses and prior service costs										0	0
Other comprehensive income (loss), net of tax										(46,700,000)	83,500,000
Comprehensive Income:
Net earnings attributable to redeemable and noncontrolling interests										17,500,000	(300,000)
Total comprehensive income (loss) attributable to redeemable interests										$ (29,200,000)	$ 83,200,000