Aetna announced a $37 billion agreement to acquire smaller rival Humana, which is the largest ever deal in the insurance industry. The merged firm will have over 33 million medical members, based on membership as of March 31, 2015. The combined company will have 2015 revenue of approximately $115 billion, with roughly 56% of that revenue coming from government-sponsored programs such as Medicare and Medicaid. The deal will face antitrust scrutiny but if it goes through it would dwarf the previous largest insurance deal announced just this week, where Swiss property and casualty giant ACE Ltd announced it was buying Chubb Corp for $28 billion. It would also dwarf Anthem’s purchase of Wellpoint in 2004 for $16.6 billion.