v3.26.1
GMO Climate Change Fund Average Annual Total Returns
 12 Months Ended 60 Months Ended 70 Months Ended 72 Months Ended 105 Months Ended 120 Months Ended
Feb. 28, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Class III              
Prospectus [Line Items]              
Average Annual Return, Percent   39.30% (0.70%)     7.17%
Performance Inception Date Apr. 05, 2017            
Class III | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent   38.71% (2.03%)     5.81%
Class III | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent   23.52% (0.82%)     5.41%
Class III | MSCI ACWI (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   22.34% 11.19%     11.72%  
Class R6              
Prospectus [Line Items]              
Average Annual Return, Percent   39.26% (0.71%)   5.16%  
Performance Inception Date Jan. 16, 2020            
Class R6 | MSCI ACWI (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   22.34% 11.19%   11.72%    
Class I              
Prospectus [Line Items]              
Average Annual Return, Percent   39.19% (0.80%) 6.06%    
Performance Inception Date Feb. 25, 2020            
Class I | MSCI ACWI (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestments)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   22.34% 11.19% 13.10%      
[1] MSCI data may not be reproduced or used for any other purpose. MSCI provides no warranties, has not prepared or approved this report, and has no liability hereunder.