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Segment and geographic information
6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Segment and geographic information
Segment and geographic information 
  
We operate as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker, who is our chief executive officer, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker evaluates our financial information and resources and assesses the performance of these resources on a consolidated basis. Since we operate in one operating segment, all required financial segment information can be found in the condensed consolidated financial statements and the notes thereto.
  
We sell our products in three geographic regions which consist of Americas; Europe, Middle East, India, and Africa (EMEIA); and Asia-Pacific (APAC). Our sales to these regions share similar economic characteristics, similar product mix, similar customers, and similar distribution methods. Revenue from the sale of our products, which are similar in nature, and software maintenance is reflected as total net sales in our Consolidated Statements of Income. (See "Note 2 -Revenue" of Notes to consolidated financial statements for total net sales by the major geographic areas in which we operate).    

Based on the billing location of the customer, total sales outside the U.S. for the three months ended June 30, 2018 and 2017 were $222 million and $204 million, respectively, and $422 million and $393 million for the six months ended June 30, 2018 and 2017, respectively. Total property and equipment, net, outside the U.S. was $133 million as of June 30, 2018 and $132 million at December 31, 2017.