v3.26.1
GMO Strategic Opportunities Allocation Fund Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 235 Months Ended
Feb. 28, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses, or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent   1.25% (0.33%) 1.35%  
MSCI World Index (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]   18.67% 11.16% 9.95%  
Class III          
Prospectus [Line Items]          
Average Annual Return, Percent   5.50% 5.31% 5.45% 6.55%
Performance Inception Date May 31, 2005        
Class III | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent   3.68% 2.45% 3.25% 4.57%
Class III | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent   3.86% 3.40% 3.73% 4.80%
Class III | GMO Strategic Opportunities Allocation Index (Fund benchmark)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [2]   14.12% 8.41% 7.93% 7.13%
Class III | Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses, or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent   1.25% (0.33%) 1.35% 2.98%
Class III | MSCI World Index (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 [3]   18.67% 11.16% 9.95% 8.23%
[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] This is a composite index that provides a performance comparison that tracks changes in the Fund’s benchmark over time. See “Fund Benchmarks and Comparative Indices” for the time periods covered by each index included in the composite index.
[3] 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.