Wireless Licenses, Goodwill and Other Intangible Assets - Amortization Expense for Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for other intangible assets	$ 2,999	$ 2,781	$ 2,687

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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