v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 117 Months Ended 120 Months Ended 377 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI All Country World Index Net          
Prospectus [Line Items]          
Average Annual Return, Percent 22.34% 11.19% 12.12% [1] 11.72%  
Morningstar Moderate Target Risk Index          
Prospectus [Line Items]          
Average Annual Return, Percent 15.95% 5.95% 7.90% [1] 7.83%  
Combined Index Portfolio          
Prospectus [Line Items]          
Average Annual Return, Percent [2] 15.50% 7.26% 8.67% [1] 8.51%  
Lipper Mixed-Asset Target Allocation Moderate Funds Index          
Prospectus [Line Items]          
Average Annual Return, Percent 13.60% 6.67% 7.94% [1] 7.80%  
Morningstar Moderately Aggressive Target Risk Index          
Prospectus [Line Items]          
Average Annual Return, Percent 18.45% 7.94% 9.78% [3] 9.59%  
Combined Index Portfolio [Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [4] 18.71% 9.25% 10.81% [3] 10.55%  
Lipper Mixed-Asset Target Allocation Growth Funds Index          
Prospectus [Line Items]          
Average Annual Return, Percent 15.28% 7.98% 9.61% [3] 9.33%  
Bloomberg U.S. Aggregate Bond Index          
Prospectus [Line Items]          
Average Annual Return, Percent 7.30% (0.36%) 1.79% [5] 2.01%  
Morningstar Moderately Conservative Target Risk Index          
Prospectus [Line Items]          
Average Annual Return, Percent 12.87% 4.06% 6.07% [5] 6.10%  
Combined Index Portfolios [Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [6] 12.34% 5.25% 6.49% [5] 6.42%  
Lipper Mixed-Asset Target Allocation Conservative Funds Index          
Prospectus [Line Items]          
Average Annual Return, Percent 10.66% 3.90% 5.23% [5] 5.25%  
T. Rowe Price Spectrum Moderate Allocation Fund-Investor Class          
Prospectus [Line Items]          
Average Annual Return, Percent 14.51% 5.92%   8.11%
Performance Inception Date         Jul. 29, 1994
T. Rowe Price Spectrum Moderate Allocation Fund-Investor Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 11.96% 3.90%   6.32%
T. Rowe Price Spectrum Moderate Allocation Fund-Investor Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 9.73% 4.08%   6.00%
T. Rowe Price Spectrum Moderate Allocation Fund-I Class          
Prospectus [Line Items]          
Average Annual Return, Percent 14.66% 6.06% 8.46%  
Performance Inception Date     Mar. 23, 2016    
T. Rowe Price Spectrum Moderate Growth Allocation Fund-Investor Class          
Prospectus [Line Items]          
Average Annual Return, Percent 17.05% 7.35%   9.65%
Performance Inception Date         Jul. 29, 1994
T. Rowe Price Spectrum Moderate Growth Allocation Fund-Investor Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 15.15% 5.68%   8.29%
T. Rowe Price Spectrum Moderate Growth Allocation Fund-Investor Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 11.19% 5.41%   7.54%
T. Rowe Price Spectrum Moderate Growth Allocation Fund-I Class          
Prospectus [Line Items]          
Average Annual Return, Percent 17.23% 7.51% 10.18%  
Performance Inception Date     Mar. 23, 2016    
T. Rowe Price Spectrum Conservative Allocation Fund-Investor Class          
Prospectus [Line Items]          
Average Annual Return, Percent 11.93% 4.70%   6.52%
Performance Inception Date         Jul. 29, 1994
T. Rowe Price Spectrum Conservative Allocation Fund-Investor Class | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 9.52% 2.86%   4.95%
T. Rowe Price Spectrum Conservative Allocation Fund-Investor Class | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 7.73% 3.02%   4.63%
T. Rowe Price Spectrum Conservative Allocation Fund-I Class          
Prospectus [Line Items]          
Average Annual Return, Percent 12.07% 4.82% 6.71%  
Performance Inception Date     Mar. 23, 2016    
[1] Return since 3/23/16.
[2] Combined Index Portfolio is a blended benchmark composed of 60% stocks (42% Russell 3000® Index and 18% MSCI All Country World Index ex USA Net), 30% bonds (Bloomberg U.S. Aggregate Bond Index), and 10% money market securities (FTSE 3-Month Treasury Bill Index) as of 5/31/26. The indices and percentages may vary over time.
[3] Return since 3/23/16.
[4] Combined Index Portfolio is a blended benchmark composed of 80% stocks (56% Russell 3000® Index and 24% MSCI All Country World Index ex USA Net) and 20% bonds (Bloomberg U.S. Aggregate Bond Index) as of 5/31/26. The indices and percentages may vary over time.
[5] Return since 3/23/16.
[6] Combined Index Portfolio is a blended benchmark composed of 40% stocks (28% Russell 3000® Index and 12% MSCI All Country World Index ex USA Net), 40% bonds (Bloomberg U.S. Aggregate Bond Index), and 20% money market securities (FTSE 3-Month Treasury Bill Index) as of 5/31/26. The indices and percentages may vary over time.