What is the appropriate length and specificity for a teaching statement?
My answer comes from Mathematics, but probably it's quite similar.  

1) 1-2 pages is pretty typical.

2) My general advice is to include details and concrete examples where possible (though course numbers are not necessary).  One problem with just being general is such statements feel very generic, and lack any real content in the sense that they don't distinguish you, in the same way many political speeches turn out.