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GMO U.S. Small Cap Value Fund Annual Total Returns
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
GMO U.S. Small Cap Value Fund | Class VI          
Prospectus [Line Items]          
Annual Return [Percent] 11.16% 22.73% (14.01%) 35.73% 2.39%