NBCUniversal makes money through making movies, amusement parks, and selling ads. CBS Corporation is mostly ads, but they're owned by National Amusements so it'

NBCUniversal makes money through making movies, amusement parks, and selling ads. CBS Corporation is mostly ads, but they're owned by National Amusements so it's really films + ads. News Corp owns HarperCollins (and books seem to be the one thing companies have never decided to stick ads in) so books + ads for them. But to answer your real question, yes I consider all of their "ad businesses" as one business (selling ads). Perhaps I could be convinced that selling ads in magazines is a completely different business than selling ads on TV - but I think it's quite a reach to suggest selling ads on search is completely different than selling ads in gmail.