The singer's ex Katie Lee said Joel always had "a little resentment" toward her for pushing him to seek treatment.

Billy Joel talks about meeting his wife Alexis for the first time in the new HBO documentary 'Billy Joel: And So It Goes,' which is now streaming.

Billy Joel is opening up about a tough moment with longtime friend and tourmate Elton John. In the second part of the new two-part HBO Documentary, "Billy Joel: And So It Goes," the "New York State of Mind" singer shared how John's public comments that he needed rehab strained their friendship.