There is a technical article from Esri that describes showing the codes in the attribute table instead of the domain text descriptions.   becomes

Try:

Customize > ArcMap Options > Tables

Then, uncheck the 'Display coded value domain and subtype descriptions' option.

There is an How To: Display coded value domains and subtype codes instead of descriptions from Esri that describes showing the codes in the attribute table instead of the domain text descriptions. 

becomes

Try:

Customize > ArcMap Options > Tables

Then, uncheck the 'Display coded value domain and subtype descriptions' option.