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Three-month paper, the most frequently auctioned maturity, sold for a negative yield of 0.423 percent, down from the minus 0.403 percent earlier this month.
Twelve-month paper, which last sold in November for a negative yield of 0.288 percent, exchanged hands at a yield of minus 0.345 percent.
The AA-rated sovereign has seen negative yields, meaning investors will pay rather than receive interest for holding Belgian paper, for its short-term maturities for all of 2015.
The amount raised was in the middle of the 1.6 to 2.0 billion euro range the agency had set last week.