Frustrated with husband's drinking

I have been married for 15 yrs we have a 13 yr old daughter.  My husband does not admit to being an alcoholic, but I know he is. He says all the time that he will ease up and just as soon as he is in my good graces, he goes right back to his usual.  I believe there are varying degrees on Alcoholism and he is functioning fine, owns his business. But his drinking has left me totally emotionally detached.  What to do?