The short answer: Alot.
The longer answer depends upon the bank’s derivative exposure. Chris includes this handy chart to help you figure out just what that cap need might be:
Sources: FDIC/IRA Bank Monitor; Q1 2008 data shown in “bank only” rollup.
WTF? $90 Trillion dollars derivative exposure for JPMorgan ? No wonder the Fed "rescue" of Bear Stearns was via JPM — it was their own derivative exposure that was at risk.
Memo to the President-Elect; How Much Capital Does a Bank Need?
Institutional Risk Analyst, August
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.