v3.26.1
GMO Emerging Markets Fund Average Annual Total Returns
 12 Months Ended 57 Months Ended 60 Months Ended 120 Months Ended 258 Months Ended 337 Months Ended 373 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
Dec. 31, 2024
Class II                  
Prospectus [Line Items]                  
Average Annual Return, Percent [1]   3.27%   (2.23%)   2.03%   5.95%  
Performance Inception Date Nov. 29, 1996                
Class II | MSCI Emerging Markets Index (reflects no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]                  
Prospectus [Line Items]                  
Average Annual Return, Percent [1],[2]   7.50%   1.70%   3.64%   5.41%  
Class III                  
Prospectus [Line Items]                  
Average Annual Return, Percent   3.40%   (2.17%)   2.09%     5.90%
Performance Inception Date Dec. 09, 1993                
Class III | After Taxes on Distributions                  
Prospectus [Line Items]                  
Average Annual Return, Percent   2.16%   (3.48%)   1.10%     4.62%
Class III | After Taxes on Distributions and Sales                  
Prospectus [Line Items]                  
Average Annual Return, Percent   2.93%   (1.70%)   1.65%     5.06%
Class III | MSCI Emerging Markets Index (reflects no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   7.50%   1.70%   3.64%     4.97%
Class VI                  
Prospectus [Line Items]                  
Average Annual Return, Percent   3.45%   (2.06%)   2.21% 7.18%    
Performance Inception Date Jun. 30, 2003                
Class VI | MSCI Emerging Markets Index (reflects no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   7.50%   1.70%   3.64% 8.18%    
Class R6                  
Prospectus [Line Items]                  
Average Annual Return, Percent   3.24% 3.53%        
Performance Inception Date Mar. 31, 2020                
Class R6 | MSCI Emerging Markets Index (reflects no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   7.50% 7.72%            
Class I                  
Prospectus [Line Items]                  
Average Annual Return, Percent   3.21%   (2.80%)      
Performance Inception Date Jan. 14, 2020                
Class I | MSCI Emerging Markets Index (reflects no deduction for fees or expenses, but are net of withholding tax on dividend reinvestment)[Member]                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   7.50%     1.18%        
[1] For the period from January 9, 1998 to August 12, 2009, no Class II shares were outstanding. The returns shown in the table for that period are those of Class III shares, which have been adjusted downward to reflect Class II’s higher total annual fund operating expenses (Class II’s expenses during these periods were calculated by adjusting Class III’s actual total annual fund operating expenses during such periods upward by the current differential between “Total annual fund operating expenses” for Class II and Class III shares shown in the Fund’s “Annual Fund operating expenses” table).
[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.