The Money Line is a simple win-or-lose bet. If someone thinks one team will win, but they don’t want to give or take any points, they bet on them “straight up.”
If someone bets on a favorite the ML will be negative, an underdog, positive. All bets are spoken of in terms of wagering an even $100. This game throws a bit of a monkey wrench because the teams are evenly matched, so money line bets are treating both teams as favorites.
Normally an underdog would have a positive moneyline, say +110. If someone were to wager $100, then they would get their $100 back, plus $110 in profit.
If someone were to wager $105 on the Cowboys to win outright, then they would get their $105 back, plus $100 in profit.
The Ravens ML is set to -115. So it would take someone betting $115 on them to win outright in order win an additional $100.