Forbes has detailed Jay’s various money making ventures including music which he wholly owns, art collection, streaming service TIDAL, label & management company Roc Nation, cognac D’Ussé, investments in real estate and more. They say that it “conservatively totals $1 billion, making him one of only a handful of entertainers to become a billionaire—and the first hip-hop artist to do so.” Congrats to a legend!
http://hiphop-n-more.com/2019/06/jay-z-first-rapper-to-become-billionaire/