Source: US. Bureau of Economic Analysis
Release: Gross Domestic Product
Cautionary note on the use of data in millions of dollars -- The tables provided include estimates in millions of dollars for NIPA series that appear regularly in the national income and product account (NIPA) tables published in the Survey of Current Business. The Bureau of Economic Analysis (BEA) generally does not include estimates at this level of precision in the published tables because the associated sampling and nonsampling errors are larger than this implied level of precision. Compared with the published aggregates, the million-dollar estimates are generally not any more accurate.
US. Bureau of Economic Analysis, Real Gross Domestic Product [GDPMC1], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/GDPMC1, July 30, 2016.