 - Transaction is a key step on path to close proposed combination designed to accelerate innovation on behalf of clients - Aon remains committed to 800 million of cost synergies and expects the combination to create significant shareholder value DUBLIN, May 12, 2021 PRNewswire -- Aon plc NYSE: AON and Willis Towers Watson NASDAQ: WLTW today announced they have signed a definitive agreement to sell Willis Re and a set of Willis Towers Watson corporate risk and broking and health and benefits services to Arthur J. Gallagher Co. Gallagher. 