How to synch (and keep separate) two computers to iCloud

I have a desktop and laptop, and I use one Apple ID. I would like to synch each to iCloud. I already do this with my desktop. My laptop has different stuff on the desktop and documents folders, and I would like to synch them separately. If I choose to synch the laptop desktop and documents folders, will that result in two separate desktops and two separate documents folders (my preference)? Or will iCloud mix everything together?