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Operating Segments and Concentrations of Credit Risk (Major Customers) (Details) - Revenue Benchmark - Customer Concentration Risk | 12 Months Ended
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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.

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