Aon – Willis asset disposal aims to ease approval of $30 billion merger Gallagher will acquire Aon-Willis assets using a combination of debt, cash and equity. PUBLISHED BY TAGS: Willis Towers Watson have agreed to sell $3.6 billion worth of assets to rival Arthur J. Gallagher & Co. in a bid to appease European competition regulators over their blockbuster merger. Insurance broker Aon’s $30 billion Willis merger attracted the scrutiny of the European Union as it went on to create the world’s biggest commercial insurance broker by revenues. The Aon – Willis asset disposal pacifies the questions raised by the European Commission and is aimed at addressing certain anti-competitive questions raised by regulators in certain other jurisdictions, said the broker in a statement.