Shareholder Report, Holdings (Details)	Aug. 31, 2024
C000024632 [Member] | One To 7 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	70.34%	[1]
C000024632 [Member] | Eight To 30 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.35%	[1]
C000024632 [Member] | Ninety One To 180 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.38%	[1]
C000024632 [Member] | One Hundred Eighty One Plus Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.00%	[1]
C000024632 [Member] | Other Assets And Liabilities Net Maturity [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.93%	[1],[2]
C000024632 [Member] | Thirty One To 90 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.00%	[1]
C000024632 [Member] | Repurchase Agreements [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.57%	[3]
C000024632 [Member] | US Government Corporations and Agencies Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	20.56%	[3]
C000024632 [Member] | US Treasury Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.94%	[3]
C000024632 [Member] | Other Assets And Liabilities Net [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.93%	[2],[3]
C000024633 [Member] | One To 7 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	70.34%	[4]
C000024633 [Member] | Eight To 30 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.35%	[4]
C000024633 [Member] | Ninety One To 180 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.38%	[4]
C000024633 [Member] | One Hundred Eighty One Plus Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.00%	[4]
C000024633 [Member] | Other Assets And Liabilities Net Maturity [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.93%	[4],[5]
C000024633 [Member] | Thirty One To 90 Days [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.00%	[4]
C000024633 [Member] | Repurchase Agreements [Member]
Holdings [Line Items]
Percent of Net Asset Value	56.57%	[6]
C000024633 [Member] | US Government Corporations and Agencies Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	20.56%	[6]
C000024633 [Member] | US Treasury Securities [Member]
Holdings [Line Items]
Percent of Net Asset Value	21.94%	[6]
C000024633 [Member] | Other Assets And Liabilities Net [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.93%	[5],[6]

[1] 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.

[2] Assets, other than investments in securities, less liabilities.

[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] 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.

[5] Assets, other than investments in securities, less liabilities.

[6] See the Fund’s Prospectus and Statement of Additional Information for descriptions of the principal types of securities in which the Fund invests.