Before talking about your idea to others, consider applying for a patent, if this is a feasible option (e.g. business process patent). Then it could eventually

Before talking about your idea to others, consider applying for a patent, if this is a feasible option (e.g. business process patent). Then it could eventually be better protected, and pose a barrier to entry for competitors. Make sure to only disclose your idea under NDA before you file the patent application. Once you have filed a patent application, you should definitely talk about your idea, since you'll have to convince potential partners and investors of it.