Now, let's go through it. As you can see, the biggest obstacle to valuing Citi is the Markets and Banking segment. That division lost $5.7 billion during the first quarter, which accounts for all of Citi's total loss and then some.
It is going to take some time to really pinpoint if my projected "normal" profit range for the investment banking operations of ~$2-$4 billion is accurate. The reason is that much of the losses right now are one-time events, not recurring costs of doing business.
For example, Citi wrote down $3 billion in Q1 just on auction rate securities and monoline insurance exposures. That accounts for more than half of the investment bank's losses for the period, but those issues won't be around long term, as they are simply due to the recent credit crunch. As of right now, I'm sticking with my estimates for the investment bank, as nothing we know now leads me to think they can't earn several billion in say, 2010.
As for the other segments, the numbers are actually not that far off. The International Consumer division's trailing twelve month profit figure is right in between my moderate and aggressive forecast. U.S. Consumer is clearly strained right now, though they are not too far off from my numbers ($6.5 billion in profit for the past year, versus a conservative estimate of $7 billion). Global Wealth Management is also not too far off, so all in all I don't see the need to change much right now.
Now, you may be asking why I am using trailing twelve month profits rather than annualizing the latest quarter. Well, I'm thinking that just as 2006 and early 2007 profits were overstated due to the credit bubble inflating, the results from Q4 2007 and Q1 2008 are understated due to the extreme strain in the credit markets. By using a rolling four quarter average, I can get a better idea of what an entire year might look like rather than extrapolating just three months. That said, this formula isn't perfect either, and we will see a lot of volatility as the strong numbers from 2007 are anniversaried.
Full Disclosure: No position in Citigroup at the time of writing