How much did Led Zeppelin get paid for the use of Rock N Roll in a Cadillac commercial?

Led Zeppelin was reportedly paid $2 million for the use of their song "Rock and Roll" in a Cadillac commercial. The deal was notable because the band had been known for their reluctance to license their music for commercial purposes. The decision to allow the song to be used in the ad marked a significant moment in the band's approach to music licensing.