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Debt (Schedule of Principal Values, Fair Values, and Carrying Values of Debt) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Jan. 29, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal Balance	$ 12,134,000,000		$ 11,180,000,000
Fair Value	12,168,873,000		11,428,029,000
Carrying Value	12,043,757,000		11,095,796,000
Less: current maturities of long-term debt	(24,000,000)		(24,000,000)
Total long-term debt, net of current maturities	$ 12,019,757,000		11,071,796,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2023
Principal Balance	$ 590,000,000		380,000,000
Fair Value	590,000,000		380,000,000
Carrying Value	$ 590,000,000		380,000,000
2018 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2025
Principal Balance	$ 2,334,000,000		2,340,000,000
Fair Value	2,301,908,000		2,310,750,000
Carrying Value	$ 2,320,200,000		2,325,391,000
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2023
Principal Balance	$ 575,000,000		575,000,000
Fair Value	590,841,000		599,662,000
Carrying Value	$ 572,370,000		572,063,000
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 08, 2024
Principal Balance	$ 620,000,000		620,000,000
Fair Value	655,185,000		670,003,000
Carrying Value	$ 616,368,000		616,131,000
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Apr. 11, 2022
Principal Balance	$ 760,000,000		760,000,000
Fair Value	767,532,000		774,410,000
Carrying Value	$ 757,703,000		757,165,000
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 09, 2023
Principal Balance	$ 640,000,000		640,000,000
Fair Value	660,928,000		671,341,000
Carrying Value	$ 636,481,000		636,045,000
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
Fair Value	1,192,249,000		1,218,613,000
Carrying Value	$ 1,155,684,000		1,155,106,000
2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jan. 09, 2026
Principal Balance	$ 750,000,000		750,000,000
Fair Value	734,505,000		752,910,000
Carrying Value	$ 743,050,000		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
Fair Value	571,254,000		597,840,000
Carrying Value	$ 594,215,000		594,081,000
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	1,124,871,000		1,127,500,000
Carrying Value	$ 1,089,616,000		1,088,924,000
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Oct. 01, 2022
Principal Balance			750,000,000
Fair Value			757,500,000
Carrying Value			746,642,000
2020 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 15, 2027
Principal Balance	$ 1,500,000,000		1,500,000,000
Fair Value	1,533,975,000		1,567,500,000
Carrying Value	$ 1,482,131,000		$ 1,481,466,000
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Feb. 01, 2029
Principal Balance	$ 1,500,000,000	$ 1,500,000,000
Fair Value	1,445,625,000
Carrying Value	$ 1,485,939,000

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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