As of the end 2004 the Old-Age and Survivors Insurance trust fund held $1,500,764,334,000 in U.S. Government securities. The Disability Insurance trust fund held $186,220,792,000. The total for the two trust funds was $1,686,985,126,000.
(That’s one trillion, 686 billion, 985 million, 126 thousand dollars.)
According to the Social Security Administration, “The average interest rate, weighted by the amount invested at each rate, is 5.492 percent at the end of December 2004.”