Formatting Negative International Currency Amounts

In financial reports I'm formatting international currency amounts like USD 12.99 or AUD 9.99, etc. What is the accepted formatting in regions where negative currency amounts are typically put in parenthesis? Balance: (USD 12.99) or Balance: USD (12.99) or something different? In other words, should the parenthesis go around the whole value including the currency code or just the number when displaying negative values with an ISO currency code?

I can't seem to find any information on generally accepted formatting of negative values together with ISO currency codes.