The FRED series Open Market Paper - Assets - Balance Sheet of Households and Nonprofit Organizations is now known as Nonprofit Organizations; Commercial Paper; Asset.
The source series id is FL163069103.Q.
This series appears in Table B.101. For further information see the assistance provided in the guide to the Financial Accounts at http://www.federalreserve.gov/apps/fof/.
Board of Governors of the Federal Reserve System (US), Nonprofit Organizations; Commercial Paper; Asset [OMPABSHNO], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/OMPABSHNO, December 11, 2017.