Source: U.S. Bureau of Economic Analysis  

Release: Gross Domestic Product  

Units:  Billions of Dollars, Seasonally Adjusted Annual Rate

Frequency:  Quarterly

A Guide to the National Income and Product Accounts of the United States (NIPA) - (http://www.bea.gov/national/pdf/nipaguid.pdf)

Imports (from table 1.1, line 17) plus payments of factor income (From table 1.9, line 3)