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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 | $ 37 | $ 34 |
Buildings | 293 | 295 |
Leasehold and land improvements | 1,442 | 1,369 |
Cell site equipment | 4,150 | 4,018 |
Switching equipment | 1,095 | 1,094 |
Office furniture and equipment | 252 | 282 |
Other operating assets and equipment | 47 | 49 |
System development | 1,479 | 1,327 |
Work in process | 261 | 317 |
Total property, plant and equipment, gross | 9,056 | 8,785 |
Accumulated depreciation and amortization | (6,450) | (6,319) |
Property, plant and equipment, net | 2,606 | 2,466 |
Depreciation and amortization expense | 662 | 669 | $ 689
(Gain) loss on asset disposals, net | $ 23 | $ 25 | $ 19
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 20 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 |  |
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 |  |
Switching equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 years |  |
Switching equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 8 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 | 5 years |  |
Other operating assets and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 3 years |  |
Other operating assets and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life | 5 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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