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Wireless Licenses, Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for other intangible assets	$ 749	$ 676	$ 2,237	$ 2,080
Remainder of 2025	764		764
2026	2,864		2,864
2027	2,307		2,307
2028	1,779		1,779
2029	1,104		1,104
2030	$ 843		$ 843

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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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