As I said above, there is a formal definition. The official term "денежные средства" contains not only cash, but also stocks, promissory notes etc. All the instruments which can be sold quickly or used like cash resources.
If we imply a private individual, "денежные средства" is just cash in their pocket or bank account. Because it's hard to imagine a person who always carries securities about. But considering the topic and the fact that "денежные средства" was used in the insurance policy (they must use only official terminology), we have to pay attention to all the meanings and nuances.