Most large companies that do layoffs give over a month of notice+severance. Perhaps they're not required to, but to be given less than a 2 week heads up with no severance is pretty rare.
How large? I don't think Allstate does this and they're Fortune 100. There were layoffs/a reorg back in 2018 in at least Allstate Benefits division but I don't think anyone got severance. I think everyone with more than X years of service was automatically not considered for severance. I know there are many former coworkers who are still there who certainly aren't still there because of their talent. Age is the only factor that comes to mind.