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Schedule III - Schedule of Real Estate and Depreciation (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 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] | $ 2,994 |  |
Gross Amount of Property Carried |  | 26,679 | $ 25,441 | $ 23,854
Gross Amount of Accumulated Depreciation Carried |  | $ (11,582) | (10,478) | $ (9,382)
Tower Count |  | 40,000 |  |
Fiber Miles |  | 80,000 |  |
Other Acquisitions | [2] | $ 75 | 68 |
Communications Infrastructure Construction and Improvements |  | 1,047 | 1,438 |
Purchase of land interests |  | 66 | 64 |
Sustaining Capital Expenditures |  | 69 | 66 |
Other Additions | [3] | 32 | 47 |
Total Additions |  | 1,289 | 1,683 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount |  | (51) | (96) |
Cost of Real Estate Sold or Disposed |  | (51) | (96) |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Deduction |  | 0 | 0 |
Depreciation |  | (1,137) | (1,114) |
Amount of Accumulated Depreciation Sold or Disposed |  | 25 | 18 |
Other Deductions to Accumulated Depreciation |  | 8 | 0 |
Real Estate Period Deductions to Accumulated Depreciation |  | $ 33 | $ 18 |
[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 the purchase of property and equipment under finance leases and installment land purchases.

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- Definition Fiber Miles that the Company owns and operates. + References No definition available. + Details
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- Definition Represents the Company's tower count. Inclusive of towers and other structures, such as rooftops + References No definition available. + Details
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- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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