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Debt (Secured Tower Revenue Securities) (Narrative) (Details) |  |  |  |  |  |  |  |  | 12 Months Ended |  |
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Mar. 09, 2018 USD ($) | Apr. 17, 2017 USD ($) | Jul. 15, 2016 USD ($) | Jul. 07, 2016 USD ($) | Oct. 14, 2015 USD ($) | Oct. 15, 2014 USD ($) | Apr. 18, 2013 USD ($) | Aug. 09, 2012 USD ($) | Dec. 31, 2018 USD ($) site | Dec. 31, 2017 USD ($) | Apr. 16, 2010 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 10,028,000,000 | $ 9,405,000,000 |
Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate number of tower sites owned by Borrowers | site |  |  |  |  |  |  |  |  | 10,426 |  |
Property management fee percentage |  |  |  |  |  |  |  |  | 4.50% |  |
U.S. Treasury rate term |  |  |  |  |  |  |  |  | 10 years |  |
Interest added to Treasury rate and credit-based spread for non-compliance |  |  |  |  |  |  |  |  | 5.00% |  |
2010-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 550,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 5.101%
Repayment date of debt instrument |  |  |  |  |  |  |  |  | Apr. 11, 2017 |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Apr. 09, 2042 |  |
Financing fees |  |  |  |  |  |  |  |  |  |  | $ 8,100,000
Write-off of deferred financing fees |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
2012 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
No prepayment consideration period |  |  |  |  |  |  |  |  | 12 months |  |
2012-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 610,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 2.933% |  |  |
Repayment date of debt instrument |  |  |  |  |  |  |  | Dec. 11, 2017 |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Dec. 09, 2042 |  |  |
Write-off of deferred financing fees |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | 610,000,000 |  |  |  |  |  |  |  |  |
2013 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 1,330,000,000 |  |  |  |
Financing fees |  |  |  |  |  |  | $ 25,500,000 |  |  |  |
Debt instrument, weighted average interest rate |  |  |  |  |  |  | 3.218% |  |  |  |
2013-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 425,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 2.24% |  |  |  |
Repayment date of debt instrument |  |  |  |  |  |  | Apr. 10, 2018 |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Apr. 09, 2043 |  | Apr. 10, 2018 |  |
Repayments of long-term debt | $ 425,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  |  | 425,000,000 |
2013-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
No prepayment consideration period |  |  |  |  |  |  |  |  | 18 months |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 575,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.722% |  |  |  |
Repayment date of debt instrument |  |  |  |  |  |  | Apr. 11, 2023 |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Apr. 09, 2048 |  | Apr. 11, 2023 |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 575,000,000 | 575,000,000 |
2013-1D Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 330,000,000 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.598% |  |  |  |
Repayment date of debt instrument |  |  |  |  |  |  | Apr. 10, 2018 |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Apr. 09, 2043 |  | Apr. 10, 2018 |  |
Repayments of long-term debt | 330,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  |  | 330,000,000 |
2014 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,540,000,000 |  |  |  |  |
Financing fees |  |  |  |  |  | $ 22,500,000 |  |  |  |  |
Debt instrument, weighted average interest rate |  |  |  |  |  | 3.289% |  |  |  |  |
2014-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
No prepayment consideration period |  |  |  |  |  |  |  |  | 12 months |  |
Debt instrument, face amount |  |  |  |  |  | $ 920,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 2.898% |  |  |  |  |
Repayment date of debt instrument |  |  |  |  |  | Oct. 08, 2019 |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Oct. 11, 2044 |  |  | Oct. 08, 2019 |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 920,000,000 | 920,000,000 |
2014-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
No prepayment consideration period |  |  |  |  |  |  |  |  | 18 months |  |
Debt instrument, face amount |  |  |  |  |  | $ 620,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 3.869% |  |  |  |  |
Repayment date of debt instrument |  |  |  |  |  | Oct. 08, 2024 |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Oct. 08, 2049 |  |  | Oct. 08, 2024 |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 620,000,000 | 620,000,000 |
2015-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 3.156% |  |  |  |  |  |
Repayment date of debt instrument |  |  |  |  | Oct. 08, 2020 |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Oct. 10, 2045 |  |  |  | Oct. 08, 2020 |  |
Financing fees |  |  |  |  | $ 11,200,000 |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  |  | 2 |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 500,000,000 | 500,000,000 |
2016-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 700,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 2.877% |  |  |  |  |  |  |
Repayment date of debt instrument |  |  |  | Jul. 09, 2021 |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Jul. 10, 2046 |  |  |  |  | Jul. 09, 2021 |  |
Financing fees |  |  |  | $ 9,500,000 |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 700,000,000 | 700,000,000 |
2017-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 760,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.168% |  |  |  |  |  |  |  |  |
Repayment date of debt instrument |  | Apr. 11, 2022 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  | Apr. 09, 2047 |  |  |  |  |  |  | Apr. 11, 2022 |  |
Financing fees |  | $ 10,200,000 |  |  |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 760,000,000 | $ 760,000,000 |
2017-1R Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 40,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 4.459% |  |  |  |  |  |  |  |  |
Repayment date of debt instrument |  | Apr. 11, 2022 |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  | Apr. 09, 2047 |  |  |  |  |  |  |  |  |
2018-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 640,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 3.448% |  |  |  |  |  |  |  |  |  |
Repayment date of debt instrument | Mar. 09, 2023 |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Mar. 09, 2048 |  |  |  |  |  |  |  | Mar. 09, 2023 |  |
Financing fees | $ 8,500,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance |  |  |  |  |  |  |  |  | $ 640,000,000 |  |
2018-1R Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 33,700,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.949% |  |  |  |  |  |  |  |  |  |
Repayment date of debt instrument | Mar. 09, 2023 |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Mar. 09, 2048 |  |  |  |  |  |  |  |  |  |
Mortgage Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, increase | $ 673,700,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, decrease after giving effect to prepayment of loan components | 81,300,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, increase in outstanding principle amount | 640,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, principal balance | $ 4,700,000,000 |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional interest rate for non-compliance |  |  |  |  |  |  |  |  | 5.00% |  |
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 |  |

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