An idea is just an idea. Understand that you really have nothing unless you can build a working prototype. No large company is going to build your prototype and give you all the credit and profit from it -- they will want complete control. I don't know what you should do in your situation, because I've been in the same situation several times -- great ideas for inventions, but no way to build prototypes or market them. Ideas, by themselves, are worth almost nothing. They are like seeds. Sure, you need them to grow the tree that produces the apples, but a seed is not an apple. You can't survive on seeds.