Can someone at Oracle provide a reference listing Oracle owned user ids?

Summary:

We are setting up a process where we will pull a list of all users and roles for verification by managers on a regular basis. We are looking for confirmation from Oracle on what user ids are owned by Oracle for backend processes.

Content (please ensure you mask any confidential information):

When querying for users and roles, we are finding the following user ids that are not ones that we created. Can someone at Oracle please confirm that all of these are valid user ids that are owned by Oracle for backend processes? If there is a published doc referencing all user ids owned by Oracle, can you please direct us to that?