Aon plc revenue for the last year amounted to 13.38 B USD, the most of which — 7.04 B USD — came from its highest performing source at the moment, Commercial Risk Solutions, the year earlier bringing 6.71 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought Aon plc 5.92 B USD, and the year before that — 5.67 B USD.