Well, my economics student brain is really churning at this problem haha.
But if I had a magic bunch of 10 Trillion dollars, I'd probably want to work a huge chunk of it into global investment in infrastructure processes (roads, bridges, etc) Also I'd work to sponsor things like the Google Internet balloon to connect the world in WiFi cause who doesn't want that? Then, I'd "spend" it all because there would be no way to invest even a trillion dollars into a central bank without hamstringing their fiscal policy so I'd buy a lot of goods in all of the developing countries in order to jump start their economies, mostly the aforementioned infrastructure improvements.
Other than that, buy a small house in Italy and just get League Pass and just chill...