G.♣.
Looks like several people have had experience with kidney stones. They are not fun and so incredibly painful.
I have had lithotripsy (blasting the stone) several times (I no longer remember how many times). I have had stones that caused pain but were passed without lithotripsy or other procedures. I have also had one removed with the basket Gamma G described.
One time I had lithotripsy, followup x-rays showed that a very large fragment remained. My urologist kept an eye on it and let me know that it may or may not pass on its own. It didn't. Had to have another lithotripsy to get rid of that one.
Kidney stones can live in your kidneys for years. If they doctor is aware of a kidney stone, he/she is probably going to want to order x-rays every so often to keep an eye on the stone(s), as they can get bigger and can cause problems. But sitting in the kidney is not going to be a problem ... unless the stone decides to move.
If you have a stone in your kidney, as long as it isn't too big to pass, the doctor is probably going to want to just leave it alone. If it causes you pain, then it has probably moved and is blocking fluids. If it gets bigger, the doctor may want to do lithotripsy to break it up.
I'm sorry I don't know anything about Detrol or overactibe bladders. My urologists have always taken a "wait and see" approach, and they have never mentioned Detrol for kidney stones.