That's highly unusual; probably the first time that has ever happened.
Typically you would have one game on each of the networks. That meant a game with visiting team from the NFC on Fox, one with the road eam from the AFC on CBS, and a third game on ESPN/NFLN/NBC. I assume this is a result of this year's cross-flex scheduling, where some NFC games end up on CBS and AFC games on FOX on occasion. The Pats-Packers game was saved for Sunday afternoon, and there are AFC games on Sunday and Monday night. The only other good AFC/CBS matchup is San Diego at Baltimore, but since the Ravens played Monday night they couldn't turn around and play Thursday.