| Label | Element | Value |
|---|---|---|
| Class Z | U.S. Treasury Repurchase Agreements [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | 56.20% |
| Class Z | U.S. Treasury Debt [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | 44.00% |
| Class Z | Other Assets and Liabilities, Net [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | (0.20%) |