Ask HN: Start-up idea in existing company, what compensation should I expect?

Hacker News focuses mainly on start-up ideas that receive outside funding but I have a question about creating a company from within the company I work for.<p>Let me preface this by noting that I had this idea before I joined the company. The product/service would combine a web interface with manufacturing. My employers existing manufacturing infrastructure is a perfect fit; we would just need to build is the web interface (and obviously market it).<p>If I bring this idea to my company what kind of compensation should I expect? A raise? Equity in the new venture? If an idea is "1% inspiration, 99% perspiration", how about at least 1% ownership?