Different countries treated Jewish populations differently, but in terms of assets, there were of course individual assets. By that I mean homes, bank accounts, property, pension plans, jewellery. When people were told they must leave, or when people fled, they were only allowed to take out 20 British pounds sterling and had to leave everything behind.
In some cases it was just informally taken over by others. In some cases it was formally expropriated by governments.
By way of example, in Iraq it was an orchestrated displacement of Jews where everyone who wanted to leave in 1950 had to register and the government established Law No. 5, which set up a custodianship, and all the Jewish property went under the control of the custodianship, not seized, not owned by the Iraqi government, but being maintained by the Iraqi government. Whereas in other countries such as Egypt, absolute expropriations of property, government taking over assets....
The important thing to also note with Jewish refugees, in juxtaposition to Palestinians, is that Jews also had communal property, extensive holdings of synagogues and cemeteries and schools and libraries and social clubs. Those vast assets are not included in that $6 billion figure. There are good records of what was available and that has entirely been taken over.