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Description of Business and Summary of Significant Accounting Policies - Narrative (Detail) shares in Millions | 12 Months Ended
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Dec. 31, 2023 segment state plan shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable segments | segment | 2 |  |
Number of states in which wireline services are provided | state | 9 |  |
Number of payment plans | plan | 2 |  |
Restricted stock units outstanding to purchase shares included in diluted earnings per common share (in shares) | shares | 4.2 | 1.9 | 1.7
Minimum threshold period for existing customers | 210 days |  |
Maximum threshold period for new customers | 210 days |  |
Wireless Licenses |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Average remaining renewal period of wireless license portfolio (in years) | 10 years | 15 years |
Wireless Licenses | Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Average remaining renewal period of wireless license portfolio (in years) | 15 years |  |
Wireless Licenses | Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Average remaining renewal period of wireless license portfolio (in years) | 10 years |  |
Non-Network Internal-Use Software |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life for finite-lived intangible assets, years | 7 years |  |
Fixed Term Plan |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Contract term | 24 months |  |
Device Payment Plan |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Contract term | 36 months |  |

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