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Schedule III - Schedule of Real Estate and Depreciation (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances | [1] | $ 1,782 |  |  |
Gross Amount of Property Carried |  | 30,474 | $ 29,383 | $ 27,936 | $ 26,679
Gross Amount of Accumulated Depreciation Carried |  | $ (15,049) | (13,817) | (12,649) | $ (11,582)
Tower Count |  | 40,000 |  |  |
Small cells either currently generating revenue or under contract |  | 105,000 |  |  |
Fiber Miles |  | 90,000 |  |  |
Other Acquisitions | [2] | $ 10 | 50 | 32 |
Communications Infrastructure Construction and Improvements |  | 1,063 | 1,254 | 1,138 |
Purchase of land interests |  | 58 | 64 | 53 |
Sustaining Capital Expenditures |  | 59 | 52 | 52 |
Other Additions | [3] | 78 | 105 | 127 |
Total Additions |  | 1,268 | 1,525 | 1,402 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount |  | (177) | (78) | (145) |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction |  | 0 | 0 | 0 |
Cost of Real Estate Sold or Disposed |  | (177) | (78) | (145) |
Depreciation |  | (1,257) | (1,222) | (1,181) |
Amount of Accumulated Depreciation Sold or Disposed |  | 22 | 38 | 105 |
Other Deductions to Accumulated Depreciation |  | 3 | 16 | 9 |
Real Estate Period Deductions to Accumulated Depreciation |  | $ 25 | $ 54 | $ 114 |
[1] | Encumbrances are reported at face value, without contemplating the effect of deferred financing costs, discounts or premiums. Certain of the Company's debt is secured by (1) a security interest in substantially all of the applicable issuers' assignable personal property, (2) a pledge of the equity interests in each applicable issuer and (3) a security interest in the applicable issuers' leases with tenants to lease tower space (space licenses).
[2] | Includes acquisitions of communications infrastructure.
[3] | Predominately relates to (1) the purchase of property and equipment under finance leases and installment land purchases, (2) asset retirement obligations and (3) capitalized stock-based compensation.

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