The FRED series Debt Outstanding Domestic Financial Sectors is now known as Financial Business; Credit Market Instruments; Liability.
The source series id is LA794104005.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), Financial Business; Credit Market Instruments; Liability, Level [DODFS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/DODFS, June 22, 2018.