Minutes Usage (unlimited versus shared)

So I have a 1400 minute (unlimited messaging and data) plan. Mobile to mobile, along with Weekend and Night calls are supposedly unlimited. I have a few questions about how these are actually counted.

For Mobile to Mobile, is it still verizon phone to verizon phone? Or is it any mobile phone nowadays?

The big one though, is I look at my bill, and it shows things like 10 minutes used on a phone call between two lines on my account. That shouldn't count toward my minutes.. but it either doesn't differentiate on the minutes per call readout, or it is for some reason putting those calls against my 1400 minutes. Anyone sure which it is, and if it's the former (doesn't separate minutes counted against the shared plan versus the unlimited minutes) is there any way to find that information out? I'm trying to figure out which phone numbers specifically are using up the most minutes.