With all respect and zero sarcasm, did you notice the 
icon in the top right?
(Fixed link)
Keep asking questions — if possible in the same thread (@jon will likely be along momentarily) — but also avail yourself of the SEARCH function to see if the question has already been answered.
Also keep in mind you’re getting into “it depends” territory so some more context will help. By which I mean: with a one pay lease you typically get a prorated refund, but if the totaled car has any equity above the payoff, who keeps the overage depends on the OEM/captive. This is overdue for an update but hopefully nuances my point:
If there is a hypothetical mystery car(s) or brand(s) you’ll get better answers as your questions get more specific