It's typically, but no longer exclusively FOX gets NFC away team/CBS gets AFC away team anymore.
Another thing I've noticed this year is that networks are now promoting other networks' games. It reflects how firmly the league has the networks over a barrel, dictating to them as a result.
Those guys suck the only time I watch them is for the steelers and they are always ******* that up, I am just surprised they did not try to go to a more competitive game some place else.