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Debt (Secured Tower Revenue Securities) (Narrative) (Details) $ in Billions | 12 Months Ended
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Dec. 31, 2023 USD ($) site
Tower Securities [Member] |
Debt Instrument [Line Items] |
Aggregate amount | $ | $ 6.9
Property management fee percentage | 4.50%
U.S. Treasury rate term | 10 years
Additional interest rate for non-compliance | 5.00%
Interest added to Treasury rate and credit-based spread for non-compliance | 5.00%
Tower Securities 2019-1C, 2020-1C, 2021-1C, 2021-2C and 2020-1C [Member] |
Debt Instrument [Line Items] |
No prepayment consideration period | 12 months
Tower Securities 2014-2C, 2020-2C and 2021-3C [Member] |
Debt Instrument [Line Items] |
No prepayment consideration period | 18 months
Minimum [Member] | Tower Securities [Member] |
Debt Instrument [Line Items] |
Aggregate number of tower sites owned by Borrowers | site | 9,892
Excess Cash Flow Reserve [Member] | Minimum [Member] | Tower Securities [Member] |
Debt Instrument [Line Items] |
Debt service coverage ratio | 1.30
Amortization Period Prepay [Member] | Maximum [Member] | Tower Securities [Member] |
Debt Instrument [Line Items] |
Debt service coverage ratio | 1.15
Advance Rents Reserve [Member] | Tower Securities [Member] |
Debt Instrument [Line Items] |
Debt service coverage ratio | 2
Term required to maintain reserve if debt service coverage ratio is exceeded | 2 months

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