Shareholder Report, Holdings (Details)	Jan. 31, 2026
C000035161 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	38.00%
C000035161 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	28.00%
C000035161 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000035161 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000035161 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035161 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000035163 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	38.00%
C000035163 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	28.00%
C000035163 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000035163 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000035163 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035163 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000035164 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	38.00%
C000035164 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	28.00%
C000035164 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000035164 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000035164 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000035164 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000016691 \| Repurchase Agreements
Holdings [Line Items]
Percent of Net Asset Value	38.00%
C000016691 \| Commercial Paper
Holdings [Line Items]
Percent of Net Asset Value	28.00%
C000016691 \| Certificates of Deposit and Bank Notes
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016691 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000016691 \| Time Deposits
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000016691 \| Asset Other Net Line
Holdings [Line Items]
Percent of Net Asset Value	0.00%

Shareholder Report, Holdings (Details)

Jan. 31, 2026