Yes, they still have it. It's just not in cash.
Fractional reserve banking works because most people don't need all their money as soon as they get paid. Most businesses keep some money in the bank too. Banks have a required percent of deposits that they must keep on hand to allow these withdrawals. And if they run low on cash, they just borrow money for a day from other banks (literally just one day). The US government can adjust the percent of required reserves or the overnight lending rate to keep banks from lending too much money out.
Banks use this money to loan to businesses or people buying houses. It works well because whenever the money is loaned out it is used for a purchase and just redeposited in another bank. A percentage of that money is retained by the bank and the rest is loaned out again. And again and again. This way money is "created" when people buy things in the economy.