Although the bank has reduced its leverage, or debt relative to assets, it still has about $600 billion of assets supported by some $30 billion of equity, meaning the value of its assets need only decline by 5 percent to make the company worthless.
http://www.reuters.com/article/newsOne/idUSN0927996520080914
http://www.reuters.com/article/newsOne/idUSN0927996520080914