As of December/2010, the United States owed China $1.164 trillion.
There is currently $4.3 trillion owed to countries such as China, Japan and the United Kingdom. China owns roughly 27% of this total.
The United States currently has a public outstanding debt total of over $14.1 trillion. Of this total, China owns roughly 8%.
Interesting note - it initially appeared as though China was slowing down their purchases of US debt in 2010. The United Kingdom, on the other hand, was rapidly ramping up their purchases - so much so, in fact, that the United Kingdom's holdings of US debt increased over 200% in 2010.
PAY BACK NOW OR STOP BULLYING CHINA.