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Debt (Secured Tower Revenue Securities) (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
May 14, 2021 | Apr. 29, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  |  | $ 12,134,000,000 | $ 11,180,000,000
2017-1C Tower Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  |  | $ 760,000,000 | $ 760,000,000
Debt instrument, interest rate, stated percentage |  |  | 3.168% |
Debt instrument, maturity date |  |  | Apr. 11, 2022 |
Subsequent Event [Member] | 2021-1R Tower Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  | $ 61,400,000 |  |
Debt instrument, interest rate, stated percentage |  | 3.625% |  |
Repayment date of debt instrument |  | Nov. 09, 2026 |  |
Debt instrument, maturity date |  | May 09, 2051 |  |
Priced [Member] | Subsequent Event [Member] | 2021-1C Tower Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, principal amount |  | $ 1,165,000,000 |  |
Debt instrument, interest rate, stated percentage |  | 1.631% |  |
Repayment date of debt instrument |  | Nov. 09, 2026 |  |
Debt instrument, maturity date |  | May 09, 2051 |  |
Scenario, Forecast [Member] | 2017-1C Tower Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 760,000,000.0 |  |  |
Scenario, Forecast [Member] | 2017-1R Tower Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 40,000,000.0 |  |  |

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