Is it a good idea to provide course detail in teaching statement?
Probably a matter of opinion, but I would suggest focusing on more general things overall, though you could say that you have well developed ideas for a course in X and in Y. But I think that the teaching statement needs to focus on your teaching philosophy and expertise, rather than details.
I say this because what you suggest seems to make you too narrowly focused. The chances are that you will need to teach other courses, including elementary courses as part of your job.
If you mention the courses and are prepared to talk more deeply when asked, I think it would be better than to give the detail at the expense of other things.
The exception would be if the position itself is focused on the areas of those courses. But still, don't neglect the general/philosophical  part of the statement.