C000005565C000190631C000219345Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_41317Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_41316Bloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond Index_35486Bloomberg U.S. Long Treasury Bond IndexBloomberg U.S. Long Treasury Bond Index_41317Bloomberg U.S. Long Treasury Bond IndexBloomberg U.S. Long Treasury Bond Index_41316Bloomberg U.S. Long Treasury Bond IndexBloomberg U.S. Long Treasury Bond Index_354860BNY-912810TZ10BNY-3622A2MG4Other0BNY-3622A2MG4Top10HoldingU.S. Treasury BondsBNY-912810TZ1Top10HoldingGovernment National Mortgage Assn.BNY-3622A2MG4No Trading Symbol [Flag]AssetsNetInvestmentCompanyPortfolioTurnover