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Revenue
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue RevenueWe serve approximately 400 customers annually in more than 40 countries and across a wide variety of industries. For 2019, 2018 and 2017, the Company's ten largest customers accounted for approximately 47%, 45% and 44% of total sales, respectively.
We typically sell to customers under master services agreements, with primarily one-year terms, or by purchase orders. We have historically experienced low customer turnover and have an average customer relationship of approximately 20 years. Our largest customer is Shaw Industries Group Inc. ("Shaw"), a significant consumer of caprolactam and Nylon 6 resin. We sell Nylon 6 resin and caprolactam to Shaw under a long-term agreement. Sales to Shaw were 22% of our total sales for each of the years ended December 31, 2019, 2018 and 2017.

Each of the Company’s product lines represented the following approximate percentage of total sales for 2019, 2018 and 2017:

Years Ended December 31,
201920182017
Nylon27%  28%  29%  
Caprolactam22%  19%  19%  
Ammonium Sulfate Fertilizer23%  20%  19%  
Chemical Intermediates28%  33%  33%  
100%  100%  100%  

The Company’s revenues by geographic area for 2019, 2018 and 2017 were as follows (in millions):

Years Ended December 31,
201920182017
United States$1,057  $1,271  $1,189  
International240  244  286  
Total$1,297  $1,515  $1,475  

Deferred Income and Customer Advances

The Company defers revenues when cash payments are received in advance of our performance. Customer advances relate primarily to sales from the ammonium sulfate business. Below is a roll-forward of Deferred income and customer advances for the twelve months ended December 31, 2019:

Deferred Income and Customer Advances2019
Opening balance January 1, 2019$22,556  
Additional cash advances19,517  
Less amounts recognized in revenues(22,377) 
Ending balance December 31, 2019$19,696  

The Company expects to recognize as revenue the December 31, 2019 ending balance of Deferred income and customer advances within one year or less.