At the close of business on Tuesday, the debt of the federal government exceeded $15 trillion for the first time--with the largest single owner of the publicly held portion of that debt being the Federal Reserve.
Over the past year, as the Federal Reserve massively increased its holdings of U.S. Treasury securities and entities in China marginally decreased theirs, the Fed surpassed the Chinese as the top owner of publicly held U.S. government debt.
[Hey China! How's that make you feel? Relieved ;-) ]