Before approaching any large company with your idea, protect yourself first. Document everything, file a provisional patent if you can, and always have them sign an NDA before sharing details. Don't reveal the full idea at once, just enough to get them interested. Position yourself as a partner seeking a deal, not just someone handing over an idea. And if possible, consult a lawyer before any formal meeting. The goal is to make it legally risky for them to take your idea without fairly compensating you.