Even if the calculation could be considered to have meaning, the media makes it sound like Buffet lost $2 billion of his $60B in wealth in 2 days. Rather, it is $2B relative to $335B of BRK market cap. This is decidedly immaterial assuming all other things were equal. But all other things were not equal and BRK investments in other stocks increased during that period more than enough to offset IBM and KO declines in stock price.

With market cap of $335B and Buffet owning about 20%, you could say he lost about $400M, but not really for during those 2 days, Berkshire Hathaway stock actually rose.

The break up value of BRK is likely at least twice the current market value so it is like trying to figure how many angels are dancing on the head of a pin.