Shareholder Report, Holdings (Details)	Jul. 31, 2026
C000024569 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	6.90%
C000024569 \| U.S. Government Agency Mortgage-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	122.10%
C000024570 \| Cash Equivalents
Holdings [Line Items]
Percent of Net Asset Value	6.90%
C000024570 \| U.S. Government Agency Mortgage-Backed Securities
Holdings [Line Items]
Percent of Net Asset Value	122.10%