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You shouldn't see this as a column, though it is a metadata field. It cannot be deleted, as it is a built-in.
It's purpose is for storing info such as the isbn of a book, as well as urls that are associalted with the book and special links to bookstores that may have sold you the book, etc. It shouldn't show up in the Book details unless the book actually has an id with a clickable link, and you can right-click on it in the Tag Browser (it's called Identifiers there) to "Hide category Identifiers". (You can also do the same to "Hide column Identifiers" -- if there had been such a column)
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