No -- most people who work at a big company know _exactly_ whether they're in danger or not. We're speaking about 5% of the original (pre-Nokia acquisition) workforce. You must know whether you're in the bottom 5%, or if your product is in the least critical 5%. Of course there are surprises and some good/productive guys will be laid off because of politics (as the process is not completely effective), but in general that's not the case.
I've seen similar things happening inside the financial industry around 2008. Many people left (sometimes much more than 5%), but we could usually guess who's going to be affected (with really high accuracy).