Senior preferred stock: 117,149 Preferred stock: 19,130 (these are the juniors) Total stockholders' equity: 3,648
If for some reason Fannie were to go into receivership, the common equity (what is left for them at the end of liquidation) is Assets - Liabilities - Senior preferred - Junior preferred. Doing the math from the balance sheet that's
That's negative $132.631 billion. Net worth includes the preferreds (both senior and junior).
The only combination of equity numbers I can use to get close to negative $9B is
Total stockholders' equity - Treasury stock - Common stock - (Junior) Preferred stock, or 3,648 - (7,400) - 687 - 19,130 = (8,769) which is negative $8.769B.
I don't know what kind of accounting sense that equation makes though.
I'm not sure about the tax hit being $10B. Fannie's DTA right now is $30.454B. Multiplying by 0.2/0.35 gives $17.402B for a writedown of $13.051B. My calculation method is likely wrong.