The FRED series Debt Outstanding Domestic Nonfinancial Sectors - Business Corporate (Nonfarm) Sector is now known as Nonfinancial Corporate Business; Credit Market Instruments; Liability.
The source series id is LA104104005.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), Nonfinancial Corporate Business; Credit Market Instruments; Liability [BCNSDODNS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/BCNSDODNS, April 25, 2019.