The FRED series Total Credit Market Debt Owed by Domestic Financial Sectors - Agency- and GSE-backed Mortgage Pools is now known as Agency-and GSE-Backed Mortgage Pools; Total Mortgages; Liability.
The source series id is FL413065005.Q.
This series appears in Table L.208. 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), Agency-and GSE-Backed Mortgage Pools; Total Mortgages; Liability [AGSEMPTCMDODFS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/AGSEMPTCMDODFS, February 23, 2018.