The FRED series Total Net Worth (Historical Cost) - Balance Sheet of Nonfarm Nonfinancial Corporate Business is now known as Nonfinancial Corporate Business; Net Worth at Historical Cost.
The source series id is FL102090115.Q.
This series appears in Table B.103. 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; Net Worth at Historical Cost, Level [TNWHCBSNNCB], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/TNWHCBSNNCB, June 25, 2018.