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Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 28,671
Reclassifications, adjustments and other	3
Ending balance	28,674
Operating Segments \| Consumer
Goodwill [Roll Forward]
Beginning balance	21,142
Reclassifications, adjustments and other	0
Ending balance	21,142
Operating Segments \| Business
Goodwill [Roll Forward]
Beginning balance	7,502
Reclassifications, adjustments and other	3
Ending balance	7,505
Other
Goodwill [Roll Forward]
Beginning balance	27
Reclassifications, adjustments and other	0
Ending balance	$ 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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