T. Rowe Price Spectrum Moderate Allocation Fund Market conditions [Member] Stock investing [Member] Fixed income markets [Member] Interest rates [Member] Mortgage- and asset-backed securities [Member] Prepayments and extensions [Member] Foreign investing [Member] Emerging markets [Member] Derivatives [Member] Hedge funds [Member] Alternative investments [Member] Credit quality [Member] Liquidity [Member] Investments in other funds [Member] Active management [Member] Cybersecurity breaches [Member] T. Rowe Price Spectrum Moderate Growth Allocation Fund T. Rowe Price Spectrum Conservative Allocation Fund T. Rowe Price Spectrum Moderate Allocation Fund-Investor Class T. Rowe Price Spectrum Moderate Allocation Fund-I Class T. Rowe Price Spectrum Moderate Growth Allocation Fund-Investor Class T. Rowe Price Spectrum Moderate Growth Allocation Fund-I Class T. Rowe Price Spectrum Conservative Allocation Fund-Investor Class T. Rowe Price Spectrum Conservative Allocation Fund-I Class MSCI All Country World Index Net Morningstar Moderate Target Risk Index Combined Index Portfolio Lipper Mixed-Asset Target Allocation Moderate Funds Index Morningstar Moderately Aggressive Target Risk Index Combined Index Portfolio [Member] Lipper Mixed-Asset Target Allocation Growth Funds Index Bloomberg U.S. Aggregate Bond Index Morningstar Moderately Conservative Target Risk Index Combined Index Portfolios [Member] Lipper Mixed-Asset Target Allocation Conservative Funds Index T. Rowe Price Spectrum Moderate Allocation Fund. T. Rowe Price Spectrum Moderate Allocation Fund-Investor Class. T. Rowe Price Spectrum Moderate Allocation Fund-I Class. T. Rowe Price Spectrum Moderate Growth Allocation Fund. T. Rowe Price Spectrum Moderate Growth Allocation Fund-Investor Class. T. Rowe Price Spectrum Moderate Growth Allocation Fund-I Class. T. Rowe Price Spectrum Conservative Allocation Fund. T. Rowe Price Spectrum Conservative Allocation Fund-Investor Class. T. Rowe Price Spectrum Conservative Allocation Fund-I Class. Cybersecurity breaches. Active management. Investments in other funds. Liquidity. Credit quality. Alternative investments. Derivatives. Emerging markets. Foreign investing. Prepayments and extensions. Interest rates. Fixed income markets. Stock investing. Market conditions. MSCI All Country World Index Net. Morningstar Moderate Target Risk Index. Combined Index Portfolio. Lipper Mixed-Asset Target Allocation Moderate Funds Index. Morningstar Moderately Aggressive Target Risk Index. Lipper Mixed-Asset Target Allocation Growth Funds Index. Bloomberg U.S. Aggregate Bond Index. Morningstar Moderately Conservative Target Risk Index. Lipper Mixed-Asset Target Allocation Conservative Funds Index. Combined Index Portfolio. Combined Index Portfolio. Hedge funds. Mortgage- and asset-backed securities.