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 and contract assets, net balances of 10% or greater of total accounts receivable, net and contract assets, net from external customers:

	Percentage of Total Revenues from External Customers			Percentage of Accounts Receivable, Net and Contract Assets, Net from External Customers
	Year Ended December 31,			December 31,
	2020	2019	2018	2020	2019
Customer A	14%	16%	18%	14%	13%
Customer B	12%	10%	14%	12%	*
Customer C	10%	11%	19%	*	13%
Customer D	10%	11%	13%	*	*

* 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
Ireland	$	1,130	$	989	$	1,098
Spain	1,034		598		—
India	1,021		1,160		1,048
South Korea	942		1,207		1,517
United States	687		2,807		1,911
United Kingdom	678		559		155
Singapore	646		533		417
Other countries	3,220		1,877		1,841
Total	$	9,358	$	9,730	$	7,987