Annual report pursuant to Section 13 and 15(d)

Customer Concentration

v3.20.4
Customer Concentration
 12 Months Ended
Dec. 31, 2020
Risks and Uncertainties [Abstract]  
Customer Concentration CUSTOMER CONCENTRATION
  
The following table shows customers with revenues of 10% or greater of total revenues from external customers and customers with accounts receivable, net balances of 10% or greater of total accounts receivable, net from external customers:
Percentage of Total Revenues from External Customers Percentage of Accounts Receivable, Net from External Customers
Year Ended December 31, December 31,
2020 2019 2018 2020 2019
Customer A 24% 27% 28% 31% 21%
Customer B 15% 18% 21% 21% 13%
Customer C 17% 19% 23% * 22%
Customer D 18% 20% 19% 22% 13%
Customer E * * —% * 13%
Customer F 11% * * * 14%
* Less than 10%
The following table shows revenues from external customers attributable to the country in which the revenues were derived (in millions). We attribute revenues from external customers to the country in which the party to the applicable agreement has its principal place of business. Substantially all of our long-lived assets are located in the United States.
Revenues from External Customers
Year Ended December 31,
2020 2019 2018
United States $ 2,769  $ 2,354  $ 1,880 
India 970  1,113  981 
South Korea 924  1,071  1,168 
Ireland 842  988  1,098 
Total $ 5,505  $ 5,526  $ 5,127