I don't know how else to say it. If team A has a + it means they are the underdog. It doesn't matter if the team favored is at home or not. + symbol, you're the underdog, - symbol, you're the favored team, home field status means nil.
I’m apparently not being clear with my question. I get the team with the minus is the favored team. I get the team with the + is the underdog. So if NU is a 10 point dog to OU you can see it listed two ways.
- NU (+10) at OU or
- NU at (-10) OU