The FRED series Debt Outstanding Domestic Nonfinancial Sectors - Household, Home Mortgage Sector is now known as Households and Nonprofit Organizations; Home Mortgages; Liability.
The source series id is LA153165105.Q.
This series appears in Table D.3. 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), Households and Nonprofit Organizations; Home Mortgages; Liability, Level [HHMSDODNS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/HHMSDODNS, February 20, 2018.