$412 bilion. http://www.treasurydirect.gov/govt/r...ir_expense.htm
Not a bad deal, really. You can run three major and several minor wars, promise everyone great retirement and medical benefits, and never have to pay for any of it. And the Fed has just announced it's going to keep real interest rates effectively at zero for the next two years. And they can print all the dollars the government needs. What's not to like?