Current data appear at http://www.federalreserve.gov/releases/cp/outstandings.htm.
On April 10, 2006, the Federal Reserve Board made changes to its commercial paper outstanding calculations. Nonfinancial outstanding is the sum of domestic, foreign, and other (unknown) nonfinancial outstanding. Other (unknown) nonfinancial outstanding is defined as nonfinancial outstanding commercial paper by issuers for which no domicile could be determined. For more information, please refer to http://www.federalreserve.gov/releases/cp/about.htm
Release: Commercial Paper
Board of Governors of the Federal Reserve System (US), Commercial Paper of Nonfinancial Companies [COMPAPER], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/COMPAPER/, September 1, 2015.