Hundreds made up around three-quarters of the total value of U.S. currency in 2014, or $968 billion of the total $1.3 trillion in circulation at the end of the year, according to the Federal Reserve Bank of St. Louis.
But not all of that money is making you rich at home. Around half of the total value of U.S. currency is abroad, according to a 2011 Fed estimate. Foreign nationals and companies buy U.S. dollars for their secure value and some use it as a medium of exchange. Among hundred-dollar bills in circulation, the portion held overseas jumped to 71 percent in 2011, from 49 percent 20 years ago.