Consolidated Statements of Total Equity and Redeemable Interest (Unaudited) - USD ($) shares in Millions | Total | Redeemable Interest [Member] | Parent [Member] | Issued Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Retained Earnings [Member]Cumulative Effect Period Of Adoption [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Noncontrolling Interests [Member] |
Beginning balance, treasury stock shares at May. 31, 2020 | | | | | | | | (144.8) | | |
Stockholders' Equity, Number of Shares | | | | | | | | | | |
Shares purchased, shares | | | | | | | | 0 | | |
Stock compensation plans, shares | | | | | | | | 2 | | |
Ending balance, common stock shares at Feb. 28, 2021 | | | | 754.6 | | | | | | |
Ending balance, treasury stock shares at Feb. 28, 2021 | | | | | | | | (142.8) | | |
Beginning balance, equity at May. 31, 2020 | $ 8,349,500,000 | | | | $ 1,348,600,000 | $ 15,982,100,000 | $ (5,700,000) | $ (6,433,300,000) | $ (2,914,400,000) | $ 291,000,000 |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] | | | | | | | | | | |
Shares purchased, value | | | | | | | | (600,000) | | |
Stock compensation plans, value | | | | | 12,900,000 | | | 82,600,000 | | |
Unearned compensation related to stock unit awards | | | | | (78,200,000) | | | | | |
Earned compensation | | | | | 68,900,000 | | | | | |
Decrease in redemption value of redeemable interest | | $ (1,600,000) | | | 1,600,000 | | | | | |
Net earnings attributable to General Mills | 1,923,000,000 | | $ 1,923,000,000 | | | 1,923,000,000 | | | | |
Comprehensive (loss) income | | | | | | | | | 71,700,000 | 31,800,000 |
Cash dividends declared | | | | | | (1,244,400,000) | | | | |
Distributions to noncontrolling interest holders | | | | | | | | | | (25,200,000) |
Reclassification of Redeemable Interest | | | | | | | | | | 0 |
Reversal of Cumulative Redeemable Interest Value Adjustments | | | | | 0 | | | | | 0 |
Acquisition of noncontrolling interest | | | | | (19,500,000) | | | | | |
Divestiture | | | | | | | | | | 0 |
Ending balance, equity at Feb. 28, 2021 | 9,187,900,000 | | | $ 75,500,000 | 1,353,800,000 | 16,655,000,000 | | $ (6,351,300,000) | (2,842,700,000) | 297,600,000 |
Beginning balance, equity attributable to redeemable noncontrolling interest at May. 31, 2020 | | 544,600,000 | | | | | | | | |
Redeemable Interest | | | | | | | | | | |
Distributions to redeemable interest holder | | (22,700,000) | | | | | | | | |
Reclassification to noncontrolling interest | | 0 | | | | | | | | |
Comprehensive (loss) income | | 75,700,000 | | | | | | | | |
Ending balance, equity attributable to redeemable noncontrolling interest at Feb. 28, 2021 | | 596,000,000 | | | | | | | | |
Beginning balance, treasury stock shares at Nov. 29, 2020 | | | | | | | | (143.2) | | |
Stockholders' Equity, Number of Shares | | | | | | | | | | |
Shares purchased, shares | | | | | | | | 0 | | |
Stock compensation plans, shares | | | | | | | | 0.4 | | |
Ending balance, common stock shares at Feb. 28, 2021 | | | | 754.6 | | | | | | |
Ending balance, treasury stock shares at Feb. 28, 2021 | | | | | | | | (142.8) | | |
Beginning balance, equity at Nov. 29, 2020 | 8,852,600,000 | | | | 1,333,300,000 | 16,374,200,000 | | $ (6,365,400,000) | (2,867,600,000) | 302,600,000 |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] | | | | | | | | | | |
Shares purchased, value | | | | | | | | (500,000) | | |
Stock compensation plans, value | | | | | (8,300,000) | | | 14,600,000 | | |
Unearned compensation related to stock unit awards | | | | | (500,000) | | | | | |
Earned compensation | | | | | 20,700,000 | | | | | |
Decrease in redemption value of redeemable interest | | (8,600,000) | | | 8,600,000 | | | | | |
Net earnings attributable to General Mills | 595,700,000 | | 595,700,000 | | | 595,700,000 | | | | |
Comprehensive (loss) income | | | | | | | | | 24,900,000 | 3,700,000 |
Cash dividends declared | | | | | | (314,900,000) | | | | |
Distributions to noncontrolling interest holders | | | | | | | | | | (8,700,000) |
Reclassification of Redeemable Interest | | | | | | | | | | 0 |
Reversal of Cumulative Redeemable Interest Value Adjustments | | | | | 0 | | | | | 0 |
Acquisition of noncontrolling interest | | | | | 0 | | | | | |
Divestiture | | | | | | | | | | 0 |
Ending balance, equity at Feb. 28, 2021 | $ 9,187,900,000 | | | $ 75,500,000 | 1,353,800,000 | 16,655,000,000 | | $ (6,351,300,000) | (2,842,700,000) | 297,600,000 |
Beginning balance, equity attributable to redeemable noncontrolling interest at Nov. 29, 2020 | | 587,700,000 | | | | | | | | |
Redeemable Interest | | | | | | | | | | |
Distributions to redeemable interest holder | | (400,000) | | | | | | | | |
Reclassification to noncontrolling interest | | 0 | | | | | | | | |
Comprehensive (loss) income | | 17,300,000 | | | | | | | | |
Ending balance, equity attributable to redeemable noncontrolling interest at Feb. 28, 2021 | | 596,000,000 | | | | | | | | |
Beginning balance, common stock shares at May. 30, 2021 | 754.6 | | | | | | | | | |
Beginning balance, treasury stock shares at May. 30, 2021 | (146.9) | | | | | | | (146.9) | | |
Stockholders' Equity, Number of Shares | | | | | | | | | | |
Shares purchased, shares | | | | | | | | (8.8) | | |
Stock compensation plans, shares | | | | | | | | 3.3 | | |
Ending balance, common stock shares at Feb. 27, 2022 | 754.6 | | | 754.6 | | | | | | |
Ending balance, treasury stock shares at Feb. 27, 2022 | (152.4) | | | | | | | (152.4) | | |
Beginning balance, equity at May. 30, 2021 | $ 9,773,200,000 | | | | 1,365,500,000 | 17,069,800,000 | $ 0 | $ (6,611,200,000) | (2,429,200,000) | 302,800,000 |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] | | | | | | | | | | |
Shares purchased, value | | | | | | | | (550,500,000) | | |
Stock compensation plans, value | | | | | 15,500,000 | | | 146,400,000 | | |
Unearned compensation related to stock unit awards | | | | | (91,300,000) | | | | | |
Earned compensation | | | | | 85,400,000 | | | | | |
Decrease in redemption value of redeemable interest | | (14,100,000) | | | 14,100,000 | | | | | |
Net earnings attributable to General Mills | 1,884,500,000 | | 1,884,500,000 | | | 1,884,500,000 | | | | |
Comprehensive (loss) income | | | | | | | | | 306,500,000 | (17,800,000) |
Cash dividends declared | | | | | | (1,241,200,000) | | | | |
Distributions to noncontrolling interest holders | | | | | | | | | | (110,800,000) |
Reclassification of Redeemable Interest | | | | | | | | | | 561,600,000 |
Reversal of Cumulative Redeemable Interest Value Adjustments | | | | | (207,400,000) | | | | | 207,400,000 |
Acquisition of noncontrolling interest | | | | | 0 | | | | | |
Divestiture | | | | | | | | | | (680,400,000) |
Ending balance, equity at Feb. 27, 2022 | 10,075,700,000 | | | $ 75,500,000 | 1,162,300,000 | 17,713,100,000 | | $ (7,015,300,000) | (2,122,700,000) | 262,800,000 |
Beginning balance, equity attributable to redeemable noncontrolling interest at May. 30, 2021 | 604,900,000 | 604,900,000 | | | | | | | | |
Redeemable Interest | | | | | | | | | | |
Distributions to redeemable interest holder | | (29,200,000) | | | | | | | | |
Reclassification to noncontrolling interest | | (561,600,000) | | | | | | | | |
Ending balance, equity attributable to redeemable noncontrolling interest at Feb. 27, 2022 | $ 0 | 0 | | | | | | | | |
Beginning balance, treasury stock shares at Nov. 28, 2021 | | | | | | | | (151.4) | | |
Stockholders' Equity, Number of Shares | | | | | | | | | | |
Shares purchased, shares | | | | | | | | (2.6) | | |
Stock compensation plans, shares | | | | | | | | 1.6 | | |
Ending balance, common stock shares at Feb. 27, 2022 | 754.6 | | | 754.6 | | | | | | |
Ending balance, treasury stock shares at Feb. 27, 2022 | (152.4) | | | | | | | (152.4) | | |
Beginning balance, equity at Nov. 28, 2021 | $ 9,804,700,000 | | | | 1,365,100,000 | 17,363,200,000 | | $ (6,915,200,000) | (2,364,100,000) | 280,200,000 |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] | | | | | | | | | | |
Shares purchased, value | | | | | | | | (175,500,000) | | |
Stock compensation plans, value | | | | | 11,500,000 | | | 75,400,000 | | |
Unearned compensation related to stock unit awards | | | | | (19,100,000) | | | | | |
Earned compensation | | | | | 31,700,000 | | | | | |
Decrease in redemption value of redeemable interest | | 0 | | | 0 | | | | | |
Net earnings attributable to General Mills | 660,300,000 | | $ 660,300,000 | | | 660,300,000 | | | | |
Comprehensive (loss) income | | | | | | | | | 241,400,000 | 2,300,000 |
Cash dividends declared | | | | | | (310,400,000) | | | | |
Distributions to noncontrolling interest holders | | | | | | | | | | (108,300,000) |
Reclassification of Redeemable Interest | | | | | | | | | | 561,600,000 |
Reversal of Cumulative Redeemable Interest Value Adjustments | | | | | (207,400,000) | | | | | 207,400,000 |
Acquisition of noncontrolling interest | | | | | (19,500,000) | | | | | |
Divestiture | | | | | | | | | | (680,400,000) |
Ending balance, equity at Feb. 27, 2022 | 10,075,700,000 | | | $ 75,500,000 | $ 1,162,300,000 | $ 17,713,100,000 | | $ (7,015,300,000) | $ (2,122,700,000) | $ 262,800,000 |
Beginning balance, equity attributable to redeemable noncontrolling interest at Nov. 28, 2021 | | 561,600,000 | | | | | | | | |
Redeemable Interest | | | | | | | | | | |
Distributions to redeemable interest holder | | 0 | | | | | | | | |
Reclassification to noncontrolling interest | | (561,600,000) | | | | | | | | |
Comprehensive (loss) income | | 0 | | | | | | | | |
Ending balance, equity attributable to redeemable noncontrolling interest at Feb. 27, 2022 | $ 0 | $ 0 | | | | | | | | |