The TIAA-CREF Bond Index Fund Rtl (TBILX) is a mutual fund that seeks to track the performance of a broad index of investment-grade bonds. This fund is managed by TIAA-CREF, a leading financial services organization, and is designed to provide investors with a low-cost, diversified option for fixed income investments. With a focus on high-quality bonds, the TBILX fund aims to provide steady income and potential capital appreciation over the long term.