v3.26.1
Shareholder Report, Holdings (Details)
Jan. 31, 2026
C000000255 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000000255 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000000255 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000000255 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000000256 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000000256 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000000256 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000000256 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000000257 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000000257 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000000257 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000000257 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000223306 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000223306 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000223306 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000223306 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000000258 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000000258 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000000258 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000000258 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000223305 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000223305 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000223305 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000223305 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%
C000260907 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value (4.40%)
C000260907 [Member] | U S Treasury Floating Rate Notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.60%
C000260907 [Member] | US Treasury Notes Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
C000260907 [Member] | US Treasury Bill Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 82.40%