You submitted what you thought was a masterful report to your boss over three weeks ago

Firstly, you can never base any assumptions on things that you think you overhear in a meeting. Perhaps they were talking about other things, or maybe you misheard. It is dangerous territory to assume right away that your manager is taking full credit for you ideas.Now, what you would need to do is set up a formal meeting with your manager. You should send an email saying that you would like to discuss several issues. Your manager will probably accept this meeting.At the time of the meeting, you then begin by stating that you would like to discuss your report, since you would like to receive formal feedback.If your boss is hesitating to discuss the report, you should ask why. State that you would like to know if your ideas are on the right track, or if you need to re-think the situation.If your manager is not cooperating, then at this time, it would be good to schedule a meeting with your manager's boss, and tell them that you are having a communication problem with your manager. Since you are well organized, you keep all emails that you have sent your manager. At this big meeting, you could then print these emails, and state that you have been sending your manager emails and reports, and she/he never gets back to you. Also feel free to show them the report that you submitted, and say that you have been waiting for 3 weeks for some sort of acknowledgment/feedback. I would then let this senior manager take charge of the situation. If your manager did in fact steal your ideas and pass them off as their own, the senior manager will take the appropriate action.This is the way I would approach this sticky situation.