Debt (Secured Tower Revenue Securities) (Narrative) (Details) $ in Billions	12 Months Ended
	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