First, I would buy myself a little cottage out in the woods and fill it up with so much cute stuff, and I'd buy myself some new clothes and stuff, and save enough money to keep me comfortable for the rest of my life. Then I'd probably spend at least half of the rest on charity, to be completely and totally honest, because 1 bil is too much money, and I'd want at least some of it to go towards something or someone who actually needs it lmao.