If you want to do a little bit of digging:
http://www.occ.treas.gov/ftp/deriv/dq102.pdf
Although this is last quarter info, it does state that exposure reduced from netting is 75%. This is not broken down for specific entities (so who knows if JPM gets the same benefit?).
But it does present a picture of the whole derivatives exposure in the banking industry and the trend is very reassuring. It has steadily risen from less than 50% in 1996.
Some other interesting factoids:
The credit exposure to risk based capital has been steadily growing for JPM/Morgan Grnty. Citi's has held quite even bobbing up and down but staying the same as 1996.
JPM Total assets $541,342 M Total derivatives $23,480,417 M
BAC $540,610 M $9,820,528 M
Citi $454,867 M $6,683,260 M
First Union $226,897 $2,304,420 M
I guess my point is to do your own homework. Although I respect Adam Hamilton as a researcher, no one is infallible.