There is no such existing table from which you can get the login details. But you can create one and log the details as follows: Create a table, for example:

Create Table login_detail (
  user_id Varchar2(50),
  login_datetime Date
)
/

Now in the login page (9999), create a process after Login to insert the user login date and time:

Begin
   Insert Into login_detail (
   user_id,
   login_datetime
   ) Values (
   :app_user,
   Sysdate
   );

Exception
  When Others Then
  Null;
End;

Then you would be able to show the last user login column in any report.