http://coding.pressbin.com/110/Treemap-shows-who-holds-US-de...
A good portion of titles are cut-off.
As has been pointed out, it's doubtful the US treasury itself counts as being in the same category as US house-holds (the US treasury prints the money it uses to buy US debt, that's hold money gets printed).
http://coding.pressbin.com/110/Treemap-shows-who-holds-US-de...