v3.25.4
Transamerica Asset Allocation - Conservative Portfolio Average Annual Total Returns
 12 Months Ended 46 Months Ended 60 Months Ended 105 Months Ended 120 Months Ended
Oct. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent   7.30%   (0.36%)   2.01%
Retail Class [Member] | Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent   7.30%   (0.36%) 0.11% 2.01%
Performance Inception Date Mar. 24, 2017          
Retail Class [Member] | Transamerica Asset Allocation – Conservative Portfolio Blended Benchmark[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   12.07%   4.00%   5.86%
Retail Class [Member] | A            
Prospectus [Line Items]            
Average Annual Return, Percent   6.04%   2.31%   4.68%
Performance Inception Date Mar. 01, 2002          
Retail Class [Member] | A | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   4.83%   1.11%   3.26%
Retail Class [Member] | A | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   3.75%   1.36%   3.21%
Retail Class [Member] | C            
Prospectus [Line Items]            
Average Annual Return, Percent   10.27%   2.65%   4.46%
Performance Inception Date Nov. 11, 2002          
Retail Class [Member] | I            
Prospectus [Line Items]            
Average Annual Return, Percent   12.55%   3.85%   5.58%
Performance Inception Date Nov. 30, 2009          
Retail Class [Member] | R            
Prospectus [Line Items]            
Average Annual Return, Percent   11.93%   3.25%   4.97%
Performance Inception Date Jun. 15, 2006          
Retail Class [Member] | R3            
Prospectus [Line Items]            
Average Annual Return, Percent   12.37% 4.79%  
Performance Inception Date Mar. 01, 2022          
[1] The Transamerica Asset Allocation - Conservative Portfolio Blended Benchmark consists of 65% Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes) and 35% MSCI World Index (reflects no deduction for fees, expenses or taxes, except foreign withholding taxes).