Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2023 |
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| Goodwill [Roll Forward] | |||
| Beginning balance | $ 22,843 | ||
| Reclassifications, adjustments and other | (2) | ||
| Ending balance | 22,841 | ||
| Goodwill | 22,841 | $ 22,841 | $ 22,843 |
| Consumer | |||
| Goodwill [Roll Forward] | |||
| Beginning balance | 21,177 | ||
| Reclassifications, adjustments and other | 0 | ||
| Ending balance | 21,177 | ||
| Goodwill | 21,177 | 21,177 | 21,177 |
| Business | |||
| Goodwill [Roll Forward] | |||
| Beginning balance | 1,666 | ||
| Reclassifications, adjustments and other | (2) | ||
| Ending balance | 1,664 | ||
| Goodwill | 1,664 | 1,664 | 1,666 |
| Goodwill accumulated impairment | $ 5,800 | $ 5,800 | $ 5,800 |
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- Definition Amount, after accumulated impairment loss, of 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://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of accumulated impairment loss for 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://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase (decrease) of asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized, classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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