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Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Land | $ 62 | $ 56 |
Buildings | 541 | 533 |
Leasehold and land improvements | 1,476 | 1,404 |
Cable and wire | 2,403 | 2,195 |
Network and switching equipment | 2,671 | 2,634 |
Cell site equipment | 4,150 | 4,017 |
Office furniture and equipment | 346 | 394 |
Other operating assets and equipment | 176 | 189 |
System development | 1,864 | 1,709 |
Work in process | 576 | 528 |
Total property, plant and equipment, gross | 14,265 | 13,659 |
Accumulated depreciation and amortization | (9,904) | (9,687) |
Property, plant and equipment, net | 4,361 | 3,972 |
Depreciation and amortization expense | 851 | 862 | $ 890
(Gain) loss on asset disposals, net | $ 26 | $ 27 | $ 12
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 | 25 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 Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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