WSJ article about Goldman Fucking Libya

So here is a question for any finance savvy pervs. According to the author, Libya currently has $37 billion frozen in the US, some with Goldman-Sachs. Use G-S as an example. Is the money they have from Libya locked into whatever investments they are currently in? Can G-S use the $ to make trades? Is it down as a company asset that can be borrowed against? Or would it be like if Goldman had a billion from Libya when the sanctions went in effect, then if they are ever lifted, Goldman owes them a billion, and can do what they want with it until then?

Yeah, we all know once the country is occupied, or revolt succeeds, then it will mostly get sopped off by rats and "security contractors", but I'm just curious about how it is handled until then.