Access 2016 - combo box

i have a Form and on it  there is a combo box field.  The Form's table is tblCredit card
The data is picked from another table named tblCard Types.  Card types are like  Visa, MC, Amex and this table has only 2 fields, the ID field which is numeric and the card type field which is text.  Thus the data would be
1   Visa
2    MC
3    Amex

When I select the data from the combo box it is saved into a field in the tblCreditcard.  Although in the combo box I only have the field the Card type, thus allowing me only to select one of the 3 data  as above, but when after selecting I look at the table tblCreditCard, the data is entered as eg ; 1 and not Visa
Looks like I am doing something wrong but I do not what it is, hope the experts can please advise me.  thank u