There are many good examples of Enterprise Architecture documentation available as reference on the Internet. All following different methodologies, but ultimately illustrating how an Enterprise Architecture documentation set can assist in driving strategy and the business forward.

A bit dated now (2004), but a good example of such a document set is the 5 volumes from NASA.

NASA Enterprise Architecture Vol 1 – NASA Enterprise Architecture

NASA Enterprise Architecture Vol 2 – Office Automation, IT Infrastructure, and Telecommunications

NASA Enterprise Architecture Vol 3 – Program Unique IT and Multi-Program / Project IT Investment Category

NASA Enterprise Architecture Vol 4 – Strategies and Structure

NASA Enterprise Architecture Vol 5 NASA To-Be Architecture, Approach to Design and Implementation

The documents are based on the Federal Enterprise Architecture Framework