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Geographic and Customer Concentrations (Tables)
 12 Months Ended
Dec. 31, 2021
Revenues [Abstract]  
Schedule of operating revenues by geographic region
The following tables present total assets as of the years ended December 31, 2021 and 2020 as well as operating revenue for the years ended December 31, 2021, 2020 and 2019 by geographic region:
Total Assets
As of December 31,
20212020
(Dollars in millions)
North America$23,296 23,511 
Europe, Middle East and Africa2,830 3,059 
Latin America1,969 2,006 
Total$28,095 28,576 
Revenue
Years Ended December 31,
202120202019
(Dollars in millions)
North America$6,365 6,411 6,307 
Europe, Middle East and Africa805 785 719 
Latin America782 737 747 
Total$7,952 7,933 7,773