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Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill	$ 22,841	$ 22,841
Goodwill accumulated impairment charge	5,800	5,800
Operating Segments | Consumer
Goodwill [Line Items]
Goodwill	21,177	21,177
Operating Segments | Business
Goodwill [Line Items]
Goodwill	$ 1,664	$ 1,664

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