Debt (Schedule of Principal Values, Fair Values, and Carrying Values of Debt) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Jul. 14, 2020	Dec. 31, 2019	Sep. 13, 2019	Apr. 11, 2018	Mar. 09, 2018	Apr. 17, 2017	Jul. 07, 2016	Oct. 14, 2015	Oct. 15, 2014	Apr. 18, 2013
Debt Instrument [Line Items]
Principal Balance	$ 11,180,000,000		$ 10,414,000,000
Fair Value	11,428,029,000		10,543,695,000
Carrying Value	11,095,796,000		10,334,425,000
Less: current maturities of long-term debt	(24,000,000)		(522,090,000)
Total long-term debt, net of current maturities	$ 11,071,796,000		9,812,335,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2023
Principal Balance	$ 380,000,000		490,000,000
Fair Value	380,000,000		490,000,000
Carrying Value	$ 380,000,000		490,000,000
2018 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2025
Principal Balance	$ 2,340,000,000		2,364,000,000		$ 2,400,000,000
Fair Value	2,310,750,000		2,369,910,000
Carrying Value	$ 2,325,391,000		2,346,183,000
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2023
Principal Balance	$ 575,000,000		575,000,000								$ 575,000,000.0
Fair Value	599,662,000		585,954,000
Carrying Value	$ 572,063,000		570,866,000
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 08, 2024
Principal Balance	$ 620,000,000		620,000,000							$ 620,000,000.0
Fair Value	670,003,000		644,912,000
Carrying Value	$ 616,131,000		615,205,000
2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 08, 2020
Principal Balance			500,000,000						$ 500,000,000.0
Fair Value			502,095,000
Carrying Value			498,090,000
2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jul. 09, 2021
Principal Balance			700,000,000					$ 700,000,000.0
Fair Value			704,095,000
Carrying Value			696,936,000
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2022
Principal Balance	$ 760,000,000		760,000,000				$ 760,000,000.0
Fair Value	774,410,000		763,405,000
Carrying Value	$ 757,165,000		755,061,000
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 09, 2023
Principal Balance	$ 640,000,000		640,000,000			$ 640,000,000.0
Fair Value	671,341,000		658,266,000
Carrying Value	$ 636,045,000		634,344,000
2019-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 12, 2025
Principal Balance	$ 1,165,000,000		1,165,000,000	$ 1,165,000,000
Fair Value	1,218,613,000		1,158,057,000
Carrying Value	$ 1,155,106,000		1,153,086,000
2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 09, 2026
Principal Balance	$ 750,000,000	$ 750,000,000.0
Fair Value	752,910,000
Carrying Value	$ 742,782,000
2020-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 11, 2028
Principal Balance	$ 600,000,000	$ 600,000,000.0
Fair Value	597,840,000
Carrying Value	$ 594,081,000
2014 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jul. 15, 2022
Principal Balance			750,000,000
Fair Value			760,313,000
Carrying Value			743,580,000
2016 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Sep. 01, 2024
Principal Balance	$ 1,100,000,000		1,100,000,000
Fair Value	1,127,500,000		1,142,625,000
Carrying Value	$ 1,088,924,000		1,086,241,000
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 01, 2022
Principal Balance	$ 750,000,000		750,000,000
Fair Value	757,500,000		764,063,000
Carrying Value	$ 746,642,000		$ 744,833,000
2020 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 15, 2027
Principal Balance	$ 1,500,000,000
Fair Value	1,567,500,000
Carrying Value	$ 1,481,466,000