Average Annual Total Returns

12 Months Ended

60 Months Ended

62 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Bloomberg U.S. Aggregate Bond Index

Prospectus [Line Items]

Average Annual Return, Percent

7.30%

(0.36%)

(0.15%)

^[1]

Bloomberg U.S. 1-5 Year Treasury TIPS Index

Prospectus [Line Items]

Average Annual Return, Percent

^[2]

6.55%

3.32%

3.54%

^[1]

T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class

Prospectus [Line Items]

Average Annual Return, Percent

6.32%

2.66%

2.89%

Performance Inception Date

Nov. 02, 2020

T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

4.36%

0.74%

1.03%

T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

3.73%

1.20%

1.40%

T. Rowe Price U.S. Limited Duration TIPS Index Fund-I Class

Prospectus [Line Items]

Average Annual Return, Percent

6.42%

2.76%

2.99%

Performance Inception Date

Nov. 02, 2020

T. Rowe Price U.S. Limited Duration TIPS Index Fund-Z Class

Prospectus [Line Items]

Average Annual Return, Percent

6.42%

2.88%

3.10%

Performance Inception Date

Nov. 02, 2020

[1]	Return since 11/2/20.
[2]	Effective October 1, 2026, the fund will change its additional benchmark for comparing the fund’s performance from the Bloomberg U.S. 1-5 Year Treasury TIPS Index to the Bloomberg U.S. 0-5 Year Treasury TIPS Index.