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Geographic and Customer Concentrations
 12 Months Ended
Dec. 31, 2022
Revenues [Abstract]  
Geographic and Customer Concentrations Geographic and Customer Concentrations
The following tables present total assets as of the years ended December 31, 2022 and 2021 as well as operating revenue for the years ended December 31, 2022, 2021 and 2020 by geographic region:
Total Assets
As of December 31,
20222021
(Dollars in millions)
North America$18,061 23,296 
Europe, Middle East and Africa1,698 2,830 
Latin America— 1,969 
Total$19,759 28,095 

Revenue
Years Ended December 31,
202220212020
(Dollars in millions)
North America$6,256 6,365 6,411 
Europe, Middle East and Africa734 805 785 
Latin America(1)
503 782 737 
Total$7,493 7,952 7,933 
_______________________________________________________________________________
(1)Includes revenue prior to closing the sale of the Latin American business on August 1, 2022.

A relatively small number of customers account for a significant percentage of our revenue. Our top ten customers accounted for approximately 15%, 17% and 16% of our total operating revenue for the years ended December 31, 2022, 2021 and 2020, respectively.