What is the maximum amount of money you can have on Steam?

Excuse me, but I'm curious about a specific detail regarding Steam's financial capabilities. Could you please elaborate on what the absolute upper limit is for the amount of money one can possess or hold within their Steam wallet? I'm interested in understanding if there's a cap, and if so, what that ceiling might be. Additionally, are there any particular conditions or restrictions that apply to reaching or maintaining such a balance? Your insights would be greatly appreciated.