Did the Oakland Raiders really just do this?

Yes they did.

According to ESPN’s Adam Schefter, the Raiders are expected to trade All-Pro defensive end/linebacker Khalil Mack to the Chicago Bears:

Sources to ESPN: Raiders and Bears have an agreement in place to trade Khalil Mack to Chicago. Still working through it, but Raiders now planning to send Mack to Chicago. — Adam Schefter (@AdamSchefter) September 1, 2018

Chicago is expected to negotiate a long-term deal with Mack that should eclipse that of Rams defensive tackle Aaron Donald, who signed a six-year extension Friday. Mack’s rookie deal was set to end after the 2018 season.

Oakland had reportedly demanded multiple first-round picks as compensation in earlier trade talks with teams.