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Debt (Secured Tower Revenue Securities) (Narrative) (Details)					12 Months Ended
	Nov. 08, 2021 USD ($)	May 14, 2021 USD ($)	Jul. 14, 2020 USD ($)	Sep. 13, 2019 USD ($)	Dec. 31, 2021 USD ($) site	Oct. 27, 2021 USD ($)	Oct. 14, 2021 USD ($)	May 04, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 09, 2018 USD ($)	Apr. 17, 2017 USD ($)	Aug. 15, 2016 USD ($)	Jul. 07, 2016 USD ($)	Oct. 14, 2015 USD ($)	Oct. 15, 2014 USD ($)	Apr. 18, 2013 USD ($)
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 12,396,000,000				$ 11,180,000,000
Tower Securities [Member]
Debt Instrument [Line Items]
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 2017-1C, 2018-1C, 2019-1C, 2020-1C, 2021-1C and 2021-2C [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
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount									$ 575,000,000							$ 575,000,000.0
Debt instrument, interest rate, stated percentage					3.722%											3.722%
Debt instrument, maturity date					Apr. 11, 2023
Debt instrument, final maturity date					Apr. 09, 2048
Financing fees																$ 11,000,000.0
Net deferred finance costs expensed							$ 2,000,000.0
2014-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount															$ 920,000,000.0
Debt instrument, interest rate, stated percentage															2.898%
Debt instrument, blended interest rate									2.898%
Debt instrument, maturity date					Oct. 08, 2019
Debt instrument, final maturity date					Oct. 11, 2044
Net deferred finance costs expensed				$ 400,000
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 620,000,000				$ 620,000,000						$ 620,000,000.0
Debt instrument, interest rate, stated percentage															3.869%
Debt instrument, blended interest rate									3.869%
Debt instrument, maturity date					Oct. 08, 2024
Debt instrument, final maturity date					Oct. 08, 2049
Financing fees															$ 9,000,000.0
2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount														$ 500,000,000.0
Debt instrument, interest rate, stated percentage					3.156%									3.156%
Debt instrument, maturity date					Oct. 08, 2020
Debt instrument, final maturity date					Oct. 10, 2045
Financing fees														$ 11,500,000
Net deferred finance costs expensed			$ 600,000
Debt service coverage ratio					2
Term required to maintain reserve if debt service coverage ratio is exceeded					2 months
Repayments of long-term debt			500,000,000.0
2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount													$ 700,000,000.0
Debt instrument, interest rate, stated percentage					2.877%								2.877%
Debt instrument, maturity date					Jul. 09, 2021
Debt instrument, final maturity date					Jul. 10, 2046
Financing fees													$ 9,500,000
Net deferred finance costs expensed			2,000,000.0
Repayments of long-term debt			700,000,000.0
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount									$ 760,000,000		$ 760,000,000.0
Debt instrument, interest rate, stated percentage					3.168%						3.168%
Debt instrument, maturity date					Apr. 11, 2022
Debt instrument, final maturity date					Apr. 09, 2047
Financing fees											$ 10,200,000
Net deferred finance costs expensed								$ 2,000,000.0
Repayments of long-term debt		$ 760,000,000.0
2017-1R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount											$ 40,000,000.0
Debt instrument, interest rate, stated percentage											4.459%
Debt instrument, maturity date					Apr. 11, 2022
Debt instrument, final maturity date					Apr. 09, 2047
Repayments of long-term debt		$ 40,000,000.0
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 640,000,000				640,000,000	$ 640,000,000.0
Debt instrument, interest rate, stated percentage					3.448%					3.448%
Debt instrument, maturity date					Mar. 09, 2023
Debt instrument, final maturity date					Mar. 09, 2048
Financing fees										$ 8,600,000
2018-1R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount										$ 33,700,000
Debt instrument, interest rate, stated percentage										4.949%
Debt instrument, maturity date					Mar. 09, 2023
Debt instrument, final maturity date					Mar. 09, 2048
2019-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 1,165,000,000	$ 1,165,000,000				1,165,000,000
Debt instrument, interest rate, stated percentage				2.836%	2.836%
Debt instrument, maturity date					Jan. 12, 2025
Debt instrument, final maturity date					Jan. 12, 2050
Financing fees				$ 12,800,000
2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 750,000,000.0		$ 750,000,000				750,000,000
Debt instrument, interest rate, stated percentage			1.884%		1.884%
Debt instrument, maturity date					Jan. 09, 2026
Debt instrument, final maturity date					Jul. 11, 2050
2020-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 600,000,000.0		$ 600,000,000				600,000,000
Debt instrument, interest rate, stated percentage			2.328%		2.328%
Debt instrument, maturity date					Jan. 11, 2028
Debt instrument, final maturity date					Jul. 09, 2052
2020 Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 1,350,000,000
Financing fees			$ 14,300,000
Debt instrument, weighted average interest rate			2.081%
Weighted average life of debt instrument through the anticipated repayment date			6 years 4 months 24 days
2020-2R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 71,100,000
Debt instrument, interest rate, stated percentage			4.336%
Debt instrument, maturity date					Jan. 11, 2028
Debt instrument, final maturity date					Jul. 09, 2052
2021-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 1,165,000,000			$ 1,165,000,000
Debt instrument, interest rate, stated percentage		1.631%			1.631%
Debt instrument, maturity date					Nov. 09, 2026
Debt instrument, final maturity date					May 09, 2051
Financing fees		$ 12,700,000
2021-1R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 61,400,000
Debt instrument, interest rate, stated percentage		3.625%
Debt instrument, maturity date					Nov. 09, 2026
Debt instrument, final maturity date					May 09, 2051
2021-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 895,000,000	$ 895,000,000.0
Debt instrument, interest rate, stated percentage					1.84%
Debt instrument, maturity date					Apr. 09, 2027
Debt instrument, final maturity date					Oct. 10, 2051
2021-3C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 895,000,000	895,000,000.0
Debt instrument, interest rate, stated percentage					2.593%
Debt instrument, maturity date					Oct. 09, 2031
Debt instrument, final maturity date					Oct. 10, 2056
2021- 2C & 3C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						1,790,000,000
Financing fees						18,300,000
Debt instrument, weighted average interest rate					2.217%
Weighted average life of debt instrument through the anticipated repayment date					7 years 9 months 18 days
2016 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount					$ 1,100,000,000				$ 1,100,000,000			$ 1,100,000,000
Debt instrument, interest rate, stated percentage					4.875%							4.875%
Debt instrument, maturity date					Sep. 01, 2024
Financing fees												$ 12,800,000
Write-off of deferred financing fees	$ 10,300,000
Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument, increase				3,000,000,000.0
Debt instrument, increase after giving effect to prepayment of loan components				1,700,000
Debt instrument, principal balance										$ 6,700,000,000
2021-3R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount						$ 94,300,000
Debt instrument, interest rate, stated percentage					4.09%
Debt instrument, maturity date					Oct. 09, 2031
Debt instrument, final maturity date					Oct. 10, 2056
SBA Guarantor, LLC [Member] \| 2019-1R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 61,400,000,000
Debt instrument, interest rate, stated percentage				4.213%
Debt instrument, maturity date					Jan. 12, 2025
Debt instrument, final maturity date					Jan. 12, 2050
Minimum [Member] \| Tower Securities [Member]
Debt Instrument [Line Items]
Aggregate number of tower sites owned by Borrowers \| site					9,902
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