v3.26.1
Shareholder Report, Holdings (Details)
Feb. 28, 2026
C000024633 [Member] | Other Assets And Liabilities Net Maturity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.31% [1],[2]
C000024633 [Member] | One Hundred Eighty One Plus Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84% [2]
C000024633 [Member] | Ninety One To 180 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.36% [2]
C000024633 [Member] | Thirty One To 90 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.67% [2]
C000024633 [Member] | Eight To 30 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.11% [2]
C000024633 [Member] | One To 7 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 71.71% [2]
C000024633 [Member] | Other Assets And Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.31% [1],[3]
C000024633 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.82% [3]
C000024633 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.50% [3]
C000024633 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.37% [3]
C000024632 [Member] | Other Assets And Liabilities Net Maturity [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.31% [4],[5]
C000024632 [Member] | One Hundred Eighty One Plus Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.84% [5]
C000024632 [Member] | Ninety One To 180 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.36% [5]
C000024632 [Member] | Thirty One To 90 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.67% [5]
C000024632 [Member] | Eight To 30 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.11% [5]
C000024632 [Member] | One To 7 Days [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 71.71% [5]
C000024632 [Member] | Other Assets And Liabilities Net [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.31% [4],[6]
C000024632 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 25.82% [6]
C000024632 [Member] | US Government Corporations and Agencies Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.50% [6]
C000024632 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 55.37% [6]
[1] Assets, other than investments in securities, less liabilities.
[2] Effective maturity is determined in accordance with the requirements of Rule 2a‑7 under the Investment Company Act of 1940, as amended, which regulates money market funds.
[3] See the Fund’s Prospectus and Statement of Additional Information for descriptions of the principal types of securities in which the Fund invests.
[4] Assets, other than investments in securities, less liabilities.
[5] Effective maturity is determined in accordance with the requirements of Rule 2a‑7 under the Investment Company Act of 1940, as amended, which regulates money market funds.
[6] See the Fund’s Prospectus and Statement of Additional Information for descriptions of the principal types of securities in which the Fund invests.