| Label | Element | Value |
|---|---|---|
| Class T | Variable Rate Demand Notes [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | 75.70% |
| Class T | Non-Financial Company Commercial Paper [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | 13.70% |
| Class T | Other Municipal Securities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | 11.30% |
| Class T | Other Assets and Liabilities, Net [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Asset Value | oef_PctOfNav | (0.70%) |