Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022
Goodwill [Roll Forward]
Beginning balance		$ 28,603
Acquisitions		70
Reclassifications, adjustments and other		(35)
Ending balance	$ 28,638	28,638
Goodwill, impairment charge	16	16
Operating Segments \| Consumer
Goodwill [Roll Forward]
Beginning balance		21,042
Acquisitions		70
Reclassifications, adjustments and other		0
Ending balance	21,112	21,112
Operating Segments \| Business
Goodwill [Roll Forward]
Beginning balance		7,515
Acquisitions		0
Reclassifications, adjustments and other		(16)
Ending balance	7,499	7,499
Other
Goodwill [Roll Forward]
Beginning balance		46
Acquisitions		0
Reclassifications, adjustments and other		(19)
Ending balance	$ 27	$ 27

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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