It could become the first trillion-dollar pharmaceutical company in the process.Eli Lilly (LLY 1.39%) and Berkshire Hathaway (BRK.A +1.14%) (BRK.B +1.20%) don't have a lot in common. The former is a pharmaceutical giant, while the latter is a diversified holding company with subsidiaries across many different sectors, from energy to transportation.However, both are among the largest corporations in the world. Be rkshire Hathaway currently has the edge with a market cap of just over $1 trillion, making it a ...