Shareholder Report
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6 Months Ended |
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Jun. 30, 2025
USD ($)
Holding
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| Shareholder Report [Line Items] |
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| Document Type |
N-CSRS
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| Amendment Flag |
false
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| Registrant Name |
State Street Navigator Securities Lending Trust
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| Entity Central Index Key |
0001011008
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| Entity Investment Company Type |
N-1A
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| Document Period End Date |
Jun. 30, 2025
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| C000026831 |
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| Shareholder Report [Line Items] |
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| Fund Name |
State Street Navigator Securities Lending Government Money Market Portfolio
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| No Trading Symbol [Flag] |
true
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| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the State Street Navigator Securities Lending Government Money Market Portfolio (the "Fund") for the period of January 1, 2025 through June 30, 2025.
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| Shareholder Report Annual or Semi-Annual |
Semi-Annual Shareholder Report
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| Additional Information [Text Block] |
You can request additional information about the Fund by contacting us at 1-877-521-4083.
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| Additional Information Phone Number |
1-877-521-4083
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| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)
Fund Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
State Street Navigator Securities Lending Government Money Market Portfolio |
$2 |
0.03%Footnote Reference* |
| Footnote |
Description |
Footnote* |
Annualized. | |
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[1] |
| AssetsNet |
$ 7,425,202,642
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| Holdings Count | Holding |
139
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| Additional Fund Statistics [Text Block] |
Key Fund Statistics as of 6/30/2025- Total Net Assets$7,425,202,642
- Number of Portfolio Holdings139
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| Holdings [Text Block] |
Asset |
% |
Treasury Debt |
38.1% |
Treasury Repurchase Agreements |
21.8% |
Government Agency Debt |
20.6% |
Government Agency Repurchase Agreements |
15.4% | |
|
| Largest Holdings [Text Block] |
Holdings |
% |
FICCRP TRI PARTY REPO A, 4.39%, due 07/01/25 |
10.1% |
BANK OF AMERICA NA TRIPARTY D REPO, 4.40%, due 07/01/25 |
6.7% |
JP MORGAN SEC LLC TPR A, 4.39%, due 07/01/25 |
3.9% |
Federal Farm Credit Banks Funding Corp., 4.45%, due 10/15/25 |
2.9% |
U.S. Treasury Bills, 4.10%, due 01/02/26 |
2.6% |
U.S. Treasury Bills, 4.20%, due 08/12/25 |
2.6% |
U.S. Treasury Bills, 4.20%, due 08/21/25 |
2.0% |
Federal Farm Credit Banks Funding Corp., 4.49%, due 04/01/26 |
1.8% |
U.S. Treasury Bills, 4.20%, due 07/22/25 |
1.8% |
U.S. Treasury Bills, 4.09%, due 11/06/25 |
1.7% | |
|
| C000171428 |
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|
| Shareholder Report [Line Items] |
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| Fund Name |
State Street Navigator Securities Lending Portfolio I
|
|
| No Trading Symbol [Flag] |
true
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the State Street Navigator Securities Lending Portfolio I (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 request additional information about the Fund by contacting us at 1-877-521-4083.
|
|
| Additional Information Phone Number |
1-877-521-4083
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)
Fund Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
State Street Navigator Securities Lending Portfolio I |
$2 |
0.04%Footnote Reference* |
| Footnote |
Description |
Footnote* |
Annualized. | |
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[2] |
| AssetsNet |
$ 677,496,432
|
|
| Holdings Count | Holding |
98
|
|
| InvestmentCompanyPortfolioTurnover |
0.00%
|
|
| Additional Fund Statistics [Text Block] |
Key Fund Statistics as of 6/30/2025- Total Net Assets$677,496,432
- Number of Portfolio Holdings98
- Portfolio Turnover Rate0%
|
|
| Holdings [Text Block] |
Asset |
% |
Certificates Of Deposit |
34.9% |
Financial Company Commercial Paper |
30.2% |
Asset Backed Commercial Paper |
13.0% |
Other Notes |
8.9% |
Other Repurchase Agreements |
6.6% |
Government Agency Repurchase Agreements |
4.1% |
Treasury Repurchase Agreements |
0.4% | |
|
| Largest Holdings [Text Block] |
Holdings |
% |
ABU DHABI INTERNATIONAL BANK I, 4.33%, due 07/01/25 |
3.6% |
HSBC Bank PLC, 4.76%, due 07/01/25 |
3.5% |
JP MORGAN SEC LLC TPR D TRI PARTY REPO D, 4.40%, due 07/01/25 |
2.7% |
Chariot Funding LLC, 4.69%, due 07/01/25 |
2.2% |
MUFG Bank Ltd/New York NY, 4.56%, due 08/21/25 |
2.2% |
NORINCHUKIN BK NEW YORK, 4.48%, due 08/13/25 |
2.2% |
Macquarie Bank Ltd, 4.40%, due 08/21/25 |
2.2% |
Longship Funding LLC, 4.38%, due 07/01/25 |
1.8% |
Svenska Handelsbanken AB, 4.75%, due 07/17/25 |
1.5% |
CANADIAN IMPERIAL BK, 4.47%, due 10/10/25 |
1.5% | |
|
| C000206723 |
|
|
| Shareholder Report [Line Items] |
|
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| Fund Name |
State Street Navigator Securities Lending Portfolio II
|
|
| No Trading Symbol [Flag] |
true
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the State Street Navigator Securities Lending Portfolio II (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 request additional information about the Fund by contacting us at 1-877-521-4083.
|
|
| Additional Information Phone Number |
1-877-521-4083
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)
Fund Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
State Street Navigator Securities Lending Portfolio II |
$2 |
0.04%Footnote Reference* |
| Footnote |
Description |
Footnote* |
Annualized. | |
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[3] |
| AssetsNet |
$ 13,155,951,231
|
|
| Holdings Count | Holding |
132
|
|
| InvestmentCompanyPortfolioTurnover |
0.00%
|
|
| Additional Fund Statistics [Text Block] |
Key Fund Statistics as of 6/30/2025- Total Net Assets$13,155,951,231
- Number of Portfolio Holdings132
- Portfolio Turnover Rate0%
|
|
| Holdings [Text Block] |
Asset |
% |
Certificates Of Deposit |
31.0% |
Other Notes |
22.7% |
Financial Company Commercial Paper |
17.8% |
Other Repurchase Agreements |
9.5% |
Asset Backed Commercial Paper |
8.8% |
Treasury Repurchase Agreements |
6.9% |
Government Agency Repurchase Agreements |
1.7% | |
|
| Largest Holdings [Text Block] |
Holdings |
% |
JP MORGAN SEC LLC TPR D TRI PARTY REPO D, 4.39%, due 07/01/25 |
6.8% |
KBC Bank NV, 4.33%, due 07/01/25 |
3.4% |
ABN AMRO Bank NV, 4.33%, due 07/01/25 |
2.7% |
Abu Dhabi Islamic Bank, 4.33%, due 07/01/25 |
2.1% |
Landesbank Baden-Wuerttemberg, 4.34%, due 07/07/25 |
1.6% |
Svenska Handelsbanken AB, 4.30%, due 07/01/25 |
1.5% |
Mizuho Bank Ltd., 4.33%, due 07/01/25 |
1.5% |
Canadian Imperial Bank of Commerce, 4.33%, due 07/01/25 |
1.5% |
Royal Bank of Canada, 4.33%, due 07/01/25 |
1.5% |
Ionic Funding LLC, 4.43%, due 07/11/25 |
1.4% | |
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