Shareholder Report |
6 Months Ended | |||||||||||||||||||||||
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Jun. 30, 2025
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Document Type | N-CSRS | |||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||
| Registrant Name | ELFUN TRUSTS | |||||||||||||||||||||||
| Entity Central Index Key | 0000032339 | |||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||
| Document Period End Date | Jun. 30, 2025 | |||||||||||||||||||||||
| C000032303 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Elfun Trusts | |||||||||||||||||||||||
| Trading Symbol | ELFNX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Elfun Trusts (the "Fund") for the period of January 1, 2025 through June 30, 2025. | |||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134. | |||||||||||||||||||||||
| Additional Information Phone Number | 1-800-242-0134 | |||||||||||||||||||||||
| Additional Information Website | https://www.ssga.com/us/en/institutional/fund-finder?type=mf | |||||||||||||||||||||||
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)
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| Expenses Paid, Amount | $ 9 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.18% | [1] | ||||||||||||||||||||||
| AssetsNet | $ 4,379,882,991 | |||||||||||||||||||||||
| Holdings Count | Holding | 45 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 13.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics as of 6/30/2025
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| Holdings [Text Block] | Top Ten Industries
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| Largest Holdings [Text Block] | Top Ten Holdings
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- Details
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