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Debt and Other Obligations (Textuals) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,950,000 |  | $ 2,400,000 | $ 12,000 |  |  |  |
Debt and Lease Obligation |  | $ 20,629,000 |  | 19,280,000 |  |  |  |  |
Maximum Upward Adjustment - Commitment Fee |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 0.01% |  |  |  |  |  |  |
Tower Revenue Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  | 5.00% |  |  |  |  |  |  |
2018 Tower Revenue Notes 3.720% due 2043 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 250,000 |  |  |  |  |  |  |
2018 Tower Revenue Notes 4.241% due 2048 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 750,000 |  |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt and Lease Obligation |  | $ 2,982,000 |  | 3,278,000 |  |  |  |  |
Secured Debt [Member] | 3.849% Secured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage |  | 3.90% | [1] |  |  |  |  |  | 3.849%
Debt and Lease Obligation |  | $ 998,000 |  | 997,000 |  |  |  |  |
Secured Debt [Member] | July 2018 Tower Revenue Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | 1,000,000 |  |  |  |
Secured Debt [Member] | 2018 Tower Revenue Notes 3.720% due 2043 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 250,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.70% | [1] |  | 3.72% |  |  |  |
Debt and Lease Obligation | [2],[3] | $ 249,000 |  | 248,000 |  |  |  |  |
Secured Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 750,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.20% | [1] |  | 4.241% |  |  |  |
Debt and Lease Obligation | [2],[3] | $ 744,000 |  | 743,000 |  |  |  |  |
Secured Debt [Member] | 2018 Tower Revenue Notes Risk Retention Tranche [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 53,000 |  |  |  |
Secured Debt [Member] | May 2015 Tower Revenue Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,000,000 |  |
Secured Debt [Member] | 2015 Tower Revenue Notes 3.222% due 2042 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 300,000 |  |
Principal amount |  | 300,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.222% |  |  |  |
Debt and Lease Obligation | [2],[3] | $ 0 |  | 299,000 |  |  |  |  |
Bank Debt [Member] | 2016 Term Loan A [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 2,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | [1],[4] | 1.20% |  |  |  |  |  |  |
Debt and Lease Obligation |  | $ 1,222,000 |  | $ 2,252,000 |  |  |  |  |
Bank Debt [Member] | Senior Unsecured 364-Day Revolving Credit Facility [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 1,000,000 |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 1,000,000 |
Bank Debt [Member] | 2016 Revolver [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | 500,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1],[4] | 1.20% |  |  |  |  |  |  |
Bonds [Member] | May 2016 Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 1,000,000 |  |
Bonds [Member] | 4.875% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.875% |  |  |  |  |
Bonds [Member] | 4.000% Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% | [1] |  |  |  |  | 4.00% |
Debt and Lease Obligation |  | $ 496,000 |  | $ 496,000 |  |  |  |  |
Bonds [Member] | 2016 Senior Unsecured Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 1,500,000 |  |
Bonds [Member] | 3.400% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 250,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.40% |  |
Bonds [Member] | 3.700% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 750,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.70% |  |
Bonds [Member] | 2.250% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.25% |  |  |  |  |
Bonds [Member] | 4.450% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 900,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.45% |  |
Bonds [Member] | 4.750% Senior Unsecured Notes [Member] [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 350,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.80% | [1] |  |  |  |  | 4.75% |
Debt and Lease Obligation |  | $ 344,000 |  | $ 344,000 |  |  |  |  |
Bonds [Member] | August 2017 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 1,750,000 |
Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 750,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.20% | [1] |  |  |  |  | 3.20% |
Debt and Lease Obligation |  | $ 747,000 |  | 745,000 |  |  |  |  |
Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 1,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.70% | [1] |  |  |  |  | 3.65% |
Debt and Lease Obligation |  | $ 995,000 |  | 994,000 |  |  |  |  |
Bonds [Member] | 3.150% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 750,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.20% | [1] |  |  | 3.15% |  |  |
Debt and Lease Obligation |  | $ 747,000 |  | 746,000 |  |  |  |  |
Bonds [Member] | 3.800% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 1,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.80% | [1] |  |  | 3.80% |  |  |
Debt and Lease Obligation |  | $ 992,000 |  | 991,000 |  |  |  |  |
Bonds [Member] | August 2019 Senior Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 900,000 |  |  |  |
Bonds [Member] | August 2019 Senior Unsecured 3.100% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 550,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.10% | [1] |  | 3.10% |  |  |  |
Debt and Lease Obligation |  | $ 545,000 |  | 544,000 |  |  |  |  |
Bonds [Member] | August 2019 Senior Unsecured 4.000% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 350,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% | [1] |  | 4.00% |  |  |  |
Debt and Lease Obligation |  | $ 345,000 |  | 345,000 |  |  |  |  |
Bonds [Member] | February 2019 Senior Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 1,000,000 |  |  |  |
Bonds [Member] | February 2019 Senior Unsecured 4.300% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 600,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.30% | [1] |  | 4.30% |  |  |  |
Debt and Lease Obligation |  | $ 593,000 |  | 593,000 |  |  |  |  |
Bonds [Member] | February 2019 Senior Unsecured 5.200% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 400,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.20% | [1] |  | 5.20% |  |  |  |
Debt and Lease Obligation |  | $ 395,000 |  | 395,000 |  |  |  |  |
Bonds [Member] | June 2020 Senior Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 2,500,000 |  |  |  |  |
Bonds [Member] | June 2020 Senior Unsecured 1.350% Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 500,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.40% | [1] | 1.35% |  |  |  |  |
Debt and Lease Obligation |  | $ 496,000 |  | $ 494,000 |  |  |  |  |
Bonds [Member] | June 2020 Senior Unsecured 2.250% Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 1,100,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.30% | [1] | 2.25% |  |  |  |  |
Debt and Lease Obligation |  | $ 1,089,000 |  | $ 1,088,000 |  |  |  |  |
Bonds [Member] | June 2020 Senior Unsecured 3.250% Notes [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 900,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.30% | [1] | 3.25% |  |  |  |  |
Debt and Lease Obligation |  | $ 890,000 |  | $ 889,000 |  |  |  |  |
Bonds [Member] | Senior Unsecured 2016 Notes 3.40% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.40% |  |  |  |  |
Bonds [Member] | April 2020 Senior Unsecured 4.150% Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 500,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.20% | [1] | 4.15% |  |  |  |  |
Debt and Lease Obligation |  | $ 490,000 |  | $ 489,000 |  |  |  |  |
Bonds [Member] | April 2020 Senior Notes [Domain] [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 1,250,000 |  |  |  |  |
Bonds [Member] | 5.250% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,650,000
Debt Instrument, Interest Rate, Stated Percentage |  | 5.25% |  |  |  |  |  |  | 5.25%
Debt and Lease Obligation |  | $ 0 |  | 1,646,000 |  |  |  |  |
Collateral Pledged [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, PPE Collaterized Amount |  | 855,000 |  |  |  |  |  |  |
Additional Principal Incurred [Member] | Bank Debt [Member] | 2016 Term Loan A [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 500,000 |  |  |
February 2016 Senior Note Upsizing [Member] | Bonds [Member] | 3.400% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 600,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.40% |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 1,000,000 |  |  |  |  |
Commercial Paper |  | 265,000 |  |  |  |  |  |  |
Debt and Lease Obligation | [5] | 265,000 |  | 285,000 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 1,000,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase (Decrease), Net |  |  |  | 750,000 | $ 750,000 | 1,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 5,000,000 |  | 5,000,000 | 4,250,000 | 3,500,000 |  | $ 2,500,000 |
Debt and Lease Obligation |  | 665,000 | [6] | 290,000 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 5,000,000 |  | $ 5,000,000 | $ 4,250,000 | $ 3,500,000 |  | $ 2,500,000 |
[1] | Represents the weighted-average stated interest rate.
[2] | If the respective series of Tower Revenue Notes are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture governing the terms of such notes) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of December 31, 2021, the Tower Revenue Notes have principal amounts of $250 million, $700 million and $750 million, with anticipated repayment dates in 2023, 2025 and 2028, respectively.
[3] | The Tower Revenue Notes, Series 2015-2 ("May 2015 Tower Revenue Notes") and Tower Revenue Notes, Series 2018-1 and 2018-2 ("July 2018 Tower Revenue Notes") are collectively referred to herein as "Tower Revenue Notes."
[4] | Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.080% to 0.300%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver. See further discussion below regarding (1) potential adjustments to such percentages and (2) LIBOR transition provisions.
[5] | The maturities of the Commercial Paper Notes, as defined below, when outstanding, may vary but may not exceed 397 days from the date of issuance.
[6] | As of December 31, 2021, the undrawn availability under the 2016 Revolver was $4.3 billion.

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