Antitrust suits result in more varied options than just breaking a company up. Microsoft had to have certain aspects of it's operations supervised by the Department of Justice for years, and had to make mandatory changes with respect to browser bundling that only ended with Windows 10/11.

Intel has settled some antitrust actions -- namely lawsuits by AMD -- with money and cross-licensing agreements. They've spun off some divisions and operations over the years but none forced that I can recall.

Microsoft lost an antitrust lawsuit a long time ago regarding making internet explorer a required part of Windows, so they had to allow other browsers in Windows for competition's sake, but they didn't get broken up. That might be what you are thinking of. I can't think of anything Intel related though.