T. Rowe Price U.S. Limited Duration TIPS Index Fund Fixed income markets [Member] Inflation-linked securities [Member] Market conditions [Member] Index investing [Member] Tracking error [Member] Interest rates [Member] Derivatives [Member] Credit quality [Member] Liquidity [Member] Cybersecurity breaches [Member] T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class T. Rowe Price U.S. Limited Duration TIPS Index Fund-I Class T. Rowe Price U.S. Limited Duration TIPS Index Fund-Z Class Bloomberg U.S. Aggregate Bond Index Bloomberg U.S. 1-5 Year Treasury TIPS Index T. Rowe Price U.S. Limited Duration TIPS Index Fund T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class T. Rowe Price U.S. Limited Duration TIPS Index Fund-I Class T. Rowe Price U.S. Limited Duration TIPS Index Fund-Z Class Fixed income markets. Inflation-linked securities. Market conditions. Index investing. Tracking error. Interest rates. Derivatives. Credit quality. Liquidity. Cybersecurity breaches. Bloomberg U.S. Aggregate Bond Index. Bloomberg U.S. 1-5 Year Treasury TIPS Index.