I am travelling internationally to DTW (Detroit), DOH-FCO-ORD-DTW. DOH-FCO on Qatar Airways and then American Airlines FCO-ORD-DTW.

I've read on multiple forums including this one that I will have to re-check-in my baggage upon arrival at ORD and will NOT go automatically to DTW. Is that regardless of airline or just specific airlines? Now if I do have to re-check, is there an official link on an airport site clarifying that?

Thank you