UnitedHealth ( UNH) issued $3 billion in debt to help pay for its acquisition of Pacificare.

The Minneapolis-based health insurer said it sold $650 million of three-year floating rate notes, along with $750 million each of five- and 10-year fixed-rate notes and $850 million of 30-year fixed-rate notes.

UnitedHealth Group treasurer Robert Oberrender concluded, "We are pleased with investor receptivity to this offering. The tranches issued today further expand our investor base and allow us to continue to improve our overall match of liability durations with the assets of our businesses. By reducing interest rate risk through asset/liability management, we are able to focus our energies on building value in our core business of making the health system work better, through effective health resource organization, large scale health transaction processing, and the application of data and informatics in a health care environment."