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Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 22,843
Reclassifications, adjustments and other	1
Ending balance	22,844
Goodwill accumulated impairment charge		$ 5,800
Operating Segments | Consumer
Goodwill [Roll Forward]
Beginning balance	21,177
Reclassifications, adjustments and other	0
Ending balance	21,177
Operating Segments | Business
Goodwill [Roll Forward]
Beginning balance	1,666
Reclassifications, adjustments and other	1
Ending balance	$ 1,667

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