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Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Land | $ 67 | $ 63 |
Buildings | 542 | 532 |
Leasehold and land improvements | 1,598 | 1,538 |
Cable and wire | 2,928 | 2,609 |
Network and switching equipment | 2,717 | 2,706 |
Cell site equipment | 4,381 | 4,248 |
Office furniture and equipment | 272 | 296 |
Other operating assets and equipment | 240 | 200 |
System development | 2,214 | 2,070 |
Work in process | 653 | 709 |
Total property, plant and equipment, gross | 15,612 | 14,971 |
Accumulated depreciation and amortization | (10,550) | (10,211) |
Property, plant and equipment, net | 5,062 | 4,760 |
Depreciation and amortization expense | $ 865 | $ 882 | $ 851
Buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 40 years |  |
Leasehold and land improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 1 year |  |
Leasehold and land improvements | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 30 years |  |
Cable and wire | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 15 years |  |
Cable and wire | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 40 years |  |
Network and switching equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 3 years |  |
Network and switching equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Cell site equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 7 years |  |
Cell site equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 30 years |  |
Office furniture and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 3 years |  |
Office furniture and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 10 years |  |
Other operating assets and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 1 year |  |
Other operating assets and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 12 years |  |
System development | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 1 year |  |
System development | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 7 years |  |

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- Definition Telecommunications equipment that primarily performs the functions of establishing and releasing connections, and transporting network operations functions. + References No definition available. + Details
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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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