Willis Towers Watson expects to generate $4.7 billion in incremental value for shareholders, made up of $375m to $675m in incremental revenues through expanded distribution of Towers Watson's health care exchange, expansion of Willis' large-market P&C brokerage business and further globalisation of Towers Watson's health and group benefits consulting business. It also expects $100m to $125m in annual merger-related cost savings and approximately $75m in annual tax savings.