The FCC's approval, which was necessary for the deal to move forward, caps a long-running corporate saga over the fate of Paramount, which owns Paramount+, the Paramount Pictures movie and television studios, the CBS television network and CBS News and Stations. Paramount also owns Nickelodeon, BET, MTV, Comedy Central and other media brands.

The merger clears the way for an $8.4 billion sale of some of the most prominent names in entertainment, including CBS, Paramount, and Nickelodeon.

The deal, which came under intense scrutiny by the Trump administration, was hailed by the F.C.C. chief, who welcomed “significant changes” at CBS, a unit of Paramount.