So, I sat down and wrote out a plan in case I croak unexpectedly. I listed all our accounts and passwords, told her who to call for life insurance and retirement and gave her the lowdown on the house situation. Oh, and I threw in some tips on how to divvy up my guns among our boys and suggestions on what to do with the rest. I put a copy in our safe at home and my desk drawer.
Several years back I had a very unpleasant flight out of Buffalo-thought for sure we were going to land nose first--- and sat down and did just what you described, practically word for word.
I also gave a copy of the document to someone who will be my executor should wife be dead also.