C000005564C000190630C000225819Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_41315Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_41314Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_35485Bloomberg U.S. 4-10 Year Treasury Bond IndexBloomberg U.S. 4-10 Year Treasury Bond Index_41315Bloomberg U.S. 4-10 Year Treasury Bond IndexBloomberg U.S. 4-10 Year Treasury Bond Index_41314Bloomberg U.S. 4-10 Year Treasury Bond IndexBloomberg U.S. 4-10 Year Treasury Bond Index_354850BNY-91282CNC10BNY-36202D7K1Other0BNY-36202D7K1Top10HoldingU.S. Treasury NotesBNY-91282CNC1Top10HoldingGovernment National Mortgage Assn.BNY-36202D7K1No Trading Symbol [Flag]AssetsNetInvestmentCompanyPortfolioTurnover