What was this movie called?

In The movie I'm guessing it was a millionaire he was old and he was at a casino at his own private table and I think it was someone that took care of him or worked for him and they ask the casino to let him and they would pay back anything he won. And after winning at the private table he got up and went out into the casino and put all his winnings on like a spinning wheel game and lost it all. What was this movie. It's killing me!!!!!