State Street SPDR Portfolio Mortgage Backed Bond Index ETF Investment Objectives and Goals - State Street SPDR Portfolio Mortgage Backed Bond Index ETF	Jun. 30, 2026
Prospectus [Line Items]
Risk/Return [Heading]	<span style="color:#000000;font-family:Arial;font-size:18pt;font-weight:bold;">State Street</span><span style="color:#000000;font-family:Arial;font-size:11.5pt;font-weight:bold;position:relative;top:-5pt;">®</span><span style="color:#000000;font-family:Arial;font-size:18pt;font-weight:bold;"> SPDR</span><span style="color:#000000;font-family:Arial;font-size:11.5pt;font-weight:bold;position:relative;top:-5pt;">®</span><span style="color:#000000;font-family:Arial;font-size:18pt;font-weight:bold;"> Portfolio Mortgage Backed Bond Index ETF</span><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">(formerly, State Street</span><span style="color:#000000;font-family:Arial;font-size:6.5pt;font-weight:bold;position:relative;top:-2.75pt;">®</span><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;"> SPDR</span><span style="color:#000000;font-family:Arial;font-size:6.5pt;font-weight:bold;position:relative;top:-2.75pt;">®</span><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;"> Portfolio Mortgage Backed Bond ETF)</span>
Objective [Heading]	<span style="color:#000000;font-family:Arial;font-size:10.5pt;font-weight:bold;margin-left:10.5pt;text-transform:uppercase;">Investment Objective</span>
Objective, Primary [Text Block]	The State Street SPDR Portfolio Mortgage Backed Bond Index ETF (the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. agency mortgage pass-through sector of the U.S. investment grade bond market.

State Street SPDR Portfolio Mortgage Backed Bond Index ETF Investment Objectives and Goals - State Street SPDR Portfolio Mortgage Backed Bond Index ETF

Jun. 30, 2026

State Street® SPDR® Portfolio Mortgage Backed Bond Index ETF(formerly, State Street® SPDR® Portfolio Mortgage Backed Bond ETF)

Objective [Heading]

Investment Objective

Objective, Primary [Text Block]

The State Street SPDR Portfolio Mortgage Backed Bond Index ETF (the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. agency mortgage pass-through sector of the U.S. investment grade bond market.