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Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 28,671
Reclassifications, adjustments and other	(29)
Ending balance	28,642
Goodwill, impairment charge	27
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	(2)
Ending balance	7,500
Other
Goodwill [Roll Forward]
Beginning balance	27
Reclassifications, adjustments and other	(27)
Ending balance	$ 0

X

- Definition

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 loss from the write-down of an asset representing the 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 (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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