State Street SPDR Portfolio SP 600 Small Cap ETF Average Annual Total Returns |
12 Months Ended | 28 Months Ended | 60 Months Ended | 65 Months Ended | 86 Months Ended | 96 Months Ended | 118 Months Ended | 120 Months Ended | |||
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| S&P SmallCap 600 Index/SSGA Small Cap Index/Russell 2000 Index (reflects no deduction for fees, expenses or taxes)[Member] | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Average Annual Return, Percent | [1] | 6.02% | 7.31% | 9.52% | |||||||
| S&P 500 Index (reflects no deduction for fees, expenses or taxes)[Member] | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Average Annual Return, Percent | 17.88% | 21.76% | 14.42% | 16.50% | 15.33% | 14.27% | 15.31% | 15.77% | 14.82% | ||
| State Street SPDR Portfolio SP 600 Small Cap ETF | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Average Annual Return, Percent | 6.01% | 7.28% | 9.50% | ||||||||
| State Street SPDR Portfolio SP 600 Small Cap ETF | After Taxes on Distributions | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Average Annual Return, Percent | 5.45% | 6.77% | 8.97% | ||||||||
| State Street SPDR Portfolio SP 600 Small Cap ETF | After Taxes on Distributions and Sales | |||||||||||
| Prospectus [Line Items] | |||||||||||
| Average Annual Return, Percent | 3.70% | 5.58% | 7.60% | ||||||||
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