|The investment seeks to track the investment results of the Barclays U.S. MBS Index.
The fund seeks to track the performance of the underlying index by investing at least 90% of its assets in the securities of the underlying index and in investments that provide substantially similar exposure to securities in the underlying index. The index measures the performance of investment-grade mortgage-backed pass-through securities issued by the Federal National Mortgage Association ("Fannie Mae"), Federal Home Loan Mortgage Corporation ("Freddie Mac") and Government National Mortgage Association ("Ginnie Mae").|
| ||MBB||Category Avg|
|Annual Report Expense Ratio (net)||0.25%||N/A|
|Annual Holdings Turnover||936.00%||N/A|
|Total Net Assets||NaN||N/A|