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Operating Segments and Concentrations of Credit Risk (Major Customers) (Details) - Revenue Benchmark - Customer Concentration Risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
[1]
Dec. 31, 2019
Concentration Risk, Percentage 75.00% 77.00% 76.00%
AT&T [Member]      
Concentration Risk, Percentage 20.00% 22.00% 21.00%
T-Mobile [Member]      
Concentration Risk, Percentage 35.00% 36.00% 22.00%
Verizon Wireless [Member]      
Concentration Risk, Percentage 20.00% 19.00% 19.00%
Sprint [Member]      
Concentration Risk, Percentage 0.00% 0.00% 14.00%
[1] (a)For the year ended December 31, 2020, revenues attributable to T-Mobile include revenues previously derived from Sprint. On April 1, 2020, T-Mobile and Sprint announced the completion of their previously disclosed merger.