v3.26.1
GMO Climate Change Fund Average Annual Total Returns
 12 Months Ended 23 Months Ended 58 Months Ended 60 Months Ended 93 Months Ended 120 Months Ended
Feb. 28, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
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]   17.49% 16.42%          
Class III                
Prospectus [Line Items]                
Average Annual Return, Percent   (25.62%)     (0.20%)   3.60%
Performance Inception Date Apr. 05, 2017              
Class III | After Taxes on Distributions                
Prospectus [Line Items]                
Average Annual Return, Percent   (25.71%)     (1.78%)   2.17%
Class III | After Taxes on Distributions and Sales                
Prospectus [Line Items]                
Average Annual Return, Percent   (15.06%)     (0.16%)   2.73%
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 [2]   17.49%     10.06%   10.41%  
Class R6                
Prospectus [Line Items]                
Average Annual Return, Percent   (25.63%)     (0.63%)  
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 [2]   17.49%       9.69%    
Class I                
Prospectus [Line Items]                
Average Annual Return, Percent   (25.70%)   0.28%    
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 [2]   17.49%   11.28%        
[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.
[2] 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.