By default in Magento 2 disable showing log details in frontend. If you are in development mode then you can enable it.
In Magento 1 local.xml.sample file found on errors directory on the root. But in Magento 2 it’s found in different place.
it will found on pub/errors folder.
Rename the local.xml.sample to local.xml on pub/errors/ directory. Then details will be shown.