Oh, I forgot about Bo Williamson in blueprint for murder! He has several millions too, since the architect wants to build williamson city with his money.
And when Bo talks about what would happen in case he died, he said his wife would get the necessary to live but there wouldn't be the billions to build cities, and that his money would be managed by a bank.
Ohh, you're right, at least in the italian version he appears to not mind a loss of 2 million dollars on the subject, I actually kinda remembered that scene, with columbo, the studio owner, nora and jerry parks.