Welcome back!
I drank just like you, 12 pack a night minimum, more on weekends. Pitiful existence for me. I am on day 5, committed to not drink today. I personally did not need detox, but that's for a Doctor to say. I was a little shaky for a day or 2, and am still very tired, but sleeping better, eating better and back in my program (AA for me).
Keep on keeping on!
Ken