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State Street SPDR Portfolio Intermediate Term Treasury Index ETF Average Annual Total Returns
 12 Months Ended 19 Months Ended 60 Months Ended 63 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg 3-10 Year U.S. Treasury Index/Bloomberg Intermediate U.S. Treasury Index (reflects no deduction for fees, expenses or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent [1] 7.51%   (0.19%)   1.70%
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent 7.30% 6.26% (0.36%) (0.24%) 2.01%
State Street SPDR Portfolio Intermediate Term Treasury Index ETF          
Prospectus [Line Items]          
Average Annual Return, Percent 7.39%   (0.24%)   1.64%
State Street SPDR Portfolio Intermediate Term Treasury Index ETF | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent 5.74%   (1.25%)   0.81%
State Street SPDR Portfolio Intermediate Term Treasury Index ETF | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent 4.35%   (0.62%)   0.89%
[1] Returns shown are reflective of the Index for periods beginning on the Benchmark Index Change Date and the Previous Benchmark Index for periods prior to the Benchmark Index Change Date.