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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher FASB
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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