Wireless Licenses, Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Capitalized interest costs | $ 740,000,000 | $ 963,000,000 | $ 1,818,000,000 | |||
| Goodwill, impairment loss | 0 | 0 | $ 5,841,000,000 | |||
| Consumer | ||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Goodwill, impairment loss | $ 0 | $ 0 | ||||
| Business | ||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Goodwill, impairment loss | 0 | 0 | $ 5,800,000,000 | |||
| Goodwill impairment, after-tax | $ 5,800,000,000 | |||||
| Wireless Licenses | ||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Wireless licenses under development | $ 7,000,000,000 | $ 10,100,000,000 | 7,000,000,000 | 10,100,000,000 | ||
| Capitalized interest costs | $ 428,000,000 | $ 616,000,000 | ||||
| Average remaining renewal period of wireless license portfolio (in years) | 10 years | 10 years | ||||
| Impairment of intangible assets, indefinite-lived (excluding goodwill) | $ 0 | $ 0 | ||||
| X | ||||||||||
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after tax, of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. No definition available.
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Average remaining renewal period of wireless license portfolio. No definition available.
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