United Technologies Corp. priced an offering of $9.25 billion of senior notes to partially finance the cash portion of its acquisition of avionics and interiors manufacturer Rockwell Collins Inc.

The offering includes $1.0 billion of 3.350% senior notes due 2021, $2.25 billion of 3.650% senior notes due 2023, $1.50 billion of 3.950% senior notes due 2025, $3.0 billion of 4.125% senior notes due 2028, $750 million of 4.450% senior notes due 2038 and $750 million of senior floating-rate notes due 2021.

The company also priced an offering of $1.75 billion of 4.625% senior notes due 2048, the proceeds from which are expected to be used for general corporate purposes and repayment of debt, including outstanding commercial paper.