I have a file on an external hard disk that my son knows about and has the password for.
There I have listed all our bank accounts, insurance policies, and told him where to find the deeds of the house, our will etc.
I have also stipulated what I want done with various possessions that it troubles me to think might just be thrown out.
Attending to this, I realised that now was the time to check whether there are letters etc. lying around that I don't want other people to read ever.
Our will also states our wishes regarding funerals and makes provision for any pets that might survive us.
I can't pretend it is pleasant attending to all this, but I have felt so much better after I sorted it all out.
OP, it sounds to me as if your DH is young enough to at least learn how to pay your utility bills, and if you still have children who are minors, perhaps you should teach him how to cook and put on the washing machine. If this isn't feasible, pay the billls by direct debit from an account in both your names, as I do. I got the bank to check my budget and work out with me how much money to transfer into the joint account each month.