Google pays well, but not the most. (Unless things have changed recently.)
(Ok, probably still per hour. But hours can be quite long.)
So it's hard to say anything general about their compensation.
I'd say I'm at best a regular ole' genius, and I can confirm that you can negotiate quite a lot.
Especially when taking a new job, and especially if you arrange for having multiple offers. Negotiating while already on the job faces quite a lot more headwind.