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GMO Emerging Markets ex-China Fund Average Annual Total Returns
 12 Months Ended 37 Months Ended 38 Months Ended 60 Months Ended 120 Months Ended
Feb. 28, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Class III            
Prospectus [Line Items]            
Average Annual Return, Percent   0.21% (4.57%)  
Performance Inception Date Nov. 17, 2021          
Class III | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   (6.57%) (7.43%)  
Class III | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   3.79% (3.53%)  
Class III | MSCI Emerging Markets ex-China Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   3.56% (0.01%)      
Class VI            
Prospectus [Line Items]            
Average Annual Return, Percent   0.38%   (4.33%)
Performance Inception Date Oct. 18, 2021          
Class VI | MSCI Emerging Markets ex-China Index (returns reflect no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   3.56%   0.05%    
[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.