Have you ever had a small sinkhole in your asphalt driveway?

This just happened to me. It’s probably 18–24 inches in diameter with a similar depth. I’m wondering if this is common? Is it going to be catastrophically expensive to repair? Does homeowners insurance play a role here or is this the kind of thing, generally speaking, that they can weasel out of because it’s not (currently) affecting the structure of the house (I’m planning on checking with my insurance company)? How freaked out should I be? If you’ve ever had to deal with this, how much misery am I in for?