It's a bit late, but if you want credit for an idea disclose it only IN WRITING and get written acknowledgement, so there's a paper trail.
Many (most?) companies who hire knowledge workers have a formal invention disclosure process that you can and should use.
Note that if you're on salary in the US as a knowledge worker, your contract probably says that all inventions in the company's fields of interest belongs to the company, since part of what they are paying you for is your creativity. And the company gets to say what is or is not covered by that clause. Elsewhere, or hourly/contractor jobs, may or may not be different; know your contract.
As others have said, though, ideas are a dime a dozen. What makes a disclosure valuable is the kind of information that would go into a patent application: a detailed description of at least some new way the idea might be applied and an explanation of what it's value is. "We should make automatic phone polishers" has little value without an explanation of why people need this and some evidence that it can actually be done (preferably at a reasonable profit). The person who takes it to that level may or may not have started from your idea, depending on how obvious the idea was to a trained practitioner (which is also one of the patentability criteria, for what that's worth.) Not that every idea is worth parenting, or should be patented, but this gives you a framework for thinking about how much of the credit is actually yours... and whether in fact someone else might have legitimately invented it independently and beaten you to "market".