Every business should have a comprehensive policy manual available for all employees. The challenge is keeping it up-to-date.
[This post was previously published in July 2017. It has been updated and revised to provide the most up-to-date information.]
An organization's policy manual, assuming they have one, is often referred to as their "policies and procedures" manual. This can be a bit misleading, however, as a true policy manual or employee handbook should really only document an organization's policies.
Their procedures should be housed in a separate document, or documents.