In week 8 following their bye-week, the Lions hosted the Pittsburgh Steelers on Sunday Night Football. The teams exchanged field goals in the first quarter, one from Chris Boswell from 34-yards, and one from Matt Prater from 48-yards. The Lions scored nine points in the second quarter via three field goals from Prater, from 37-yards, 51-yards, and 34-yards, respectively. The Steelers responded with a five-yard touchdown run from Le'Veon Bell, to make the score 12-10 in favor of Detroit at half-time. The Steelers scored 10 points in the third quarter via a 38-yard field from Boswell, and a 97-yard touchdown pass from Ben Roethlisberger to JuJu Smith-Schuster. The Lions responded with a 19-yard field goal from Prater in the fourth quarter, making the final score 20-15 in favor of Pittsburgh. The Lions had 482 total yards of offense without scoring a touchdown. This was the third-highest yardage total without a touchdown in NFL history.
Question: How many points was Detroit winning by at halftime?
Answer: 2