Marsh & McLennan Cos. Inc. has sold $5 billion in senior notes via a public offering.

The offering consists of $700 million of 3.500% senior notes due 2020, $1 billion of its 3.875% senior notes due 2024, $1.25 billion of 4.375% senior notes due 2029, $500 million of 4.750% senior notes due 2039, $1.25 billion of 4.900% senior notes due 2049 and $300 million of floating rate senior notes due 2021.

Interest on the 2020 notes is payable June 29 and Dec. 29 in each year, beginning June 29. Interest on the 2024, 2029, 2039 and 2049 notes is payable March 15 and Sept. 15 in each year, beginning Sept. 15.