An unmanaged index that tracks the total U.S. bond market, which includes U.S. Treasury, government agency, investment-grade corporate bond and mortgage-backed securities with maturities of at least one year. The index includes reinvestment of interest. An investor cannot invest directly in an index.

A benchmark index made up of the Lehman Brothers Government/Corporate Bond Index, Mortgage-Backed Securities Index, and Asset-Backed Securities Index, including securities that are of investment-grade [..]