Freddie Mac plans to sell at least $6 billion of reference notes this week as yields on past issues fall relative to benchmarks.

The debt includes two-year notes maturing Jan. 7, 2011, and five-year debt due Jan. 7, 2014, the government-sponsored enterprise said Monday. The sales will be "benchmark size," or at least $3 billion for a new issue.

Goldman Sachs Group Inc., Barclays PLC, and Citigroup Inc. were hired to manage the sales.

Last month Freddie sold $1 billion of reference debt in a reopening.

The difference between yields on Freddie's two-year notes and Treasuries of similar maturity has declined to 53 basis points since reaching a record 184 basis points Nov. 20, according to Bloomberg data.

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