I would start MY own country with an army of super powered machines and take over America and make it a better place.(Especially our border and traffic)
Id buy a tv and some video games but if I had 10 trillion then I buy 20 houses, demolish them, build a mansion over the land then buy all the rest of the houses in the city and put them up for rent, and build a mansion in my mansion, along with a walmart and taco bell, and I would have a cage full of spider monkeys, and have statue made of gold in my front yard along with all plexi-glass windows and a gold painted titanium front door, but 10 million dollars now days isn't much to work with, by the way trillion is a real number just so you people know.