You may, as far as I know, bring any amount of cash you like on your trip. The key criteria is to DECLARE IT and have documentation proving it is from a lawful source / transaction, such as a withdrawal from your bank account. Having said that, anyone with $10K+ USD going through Ezeiza is going to be a celebrity as far as aduanas is concerned. And they are not all honest, so there is a very real possibility that you could be marked for robbery as soon as you leave the front door of the airport terminal. The better, no make that the best thing I think one could do would be to carry a far lesser sum of cash, and use a debit or credit card for whatever you would spend that much cash on while you are in the country. Yes, you may have transaction costs, but think of it as cheap insurance vs being robbed of 100% of your bankroll.