v3.26.1
GMO U.S. Equity Fund Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 270 Months Ended 483 Months Ended
Feb. 28, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Class III            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   22.22% 15.82% 13.97%   11.65%
Performance Inception Date Sep. 18, 1985          
Class III | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   18.89% 11.86% 10.31%   8.78%
Class III | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   15.20% 11.51% 10.19%   8.76%
Class III | S&P Composite 1500 Index (returns reflect no deduction for fees, expenses, or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   17.02% 13.96% 14.46%    
Class VI            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   22.36% 15.94% 14.07% 10.10%  
Performance Inception Date Jun. 30, 2003          
Class VI | S&P Composite 1500 Index (returns reflect no deduction for fees, expenses, or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   17.02% 13.96% 14.46% 11.15%  
[1] The Fund is the successor to GMO U.S. Core Fund, a former series of GMO Trust that had an investment objective and investment policies and restrictions substantially identical to those of the Fund. Performance of the Fund through September 16, 2005 is that of GMO U.S. Core Fund and reflects GMO U.S. Core Fund’s annual operating expenses (0.02% higher than those of the Fund).