It can vary, no absolute guarantees, but I have mentioned suicidal ideations to my therapist and she has held them in confidence, supported me, comforted me, and stood by me until I felt better.

My belief is that most therapists will not report suicidal ideations: what they must be wary of and report is suicidal intention which is at all likely to be carried out. Do you have a plan, do you have a timeline, is the suicidal condition persisting. In other words, I think they realistically judge the severity of the situation and your history to determine if they need to report it to keep you safe, or if keeping that confidence will help you more.

Of course, every therapist is different, it will take some of your good judgement to assess yours, but I strongly encourage you to share your ideations as best you can.

P.S. I see you added "from a T, Pdoc, or psychologist"

I would expect more tolerance from a T or psychologist based on their training than a Pdoc who I don't think is equipped to hear about that so much and who *in my personal experience only* works in a more clinical, limited framework, but... I'm sure others will have more depth to offer on that. If it were me- I'd tell my therapist, or whoever I was closest to, whoever knew me best, if I was hoping them to realize it was just ideas, not plans, not intent.