Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Beginning balance	$ 24,389
Acquisitions (2)	405
Reclassifications, adjustments and other	5
Ending balance	24,799
Goodwill accumulated impairment charge	4,800	$ 4,800
Operating Segments \| Consumer
Goodwill [Line Items]
Beginning balance	17,104
Acquisitions (2)	109
Reclassifications, adjustments and other	0
Ending balance	17,213
Operating Segments \| Business
Goodwill [Line Items]
Beginning balance	7,269
Acquisitions (2)	296
Reclassifications, adjustments and other	5
Ending balance	7,570
Other
Goodwill [Line Items]
Beginning balance	16
Acquisitions (2)	0
Reclassifications, adjustments and other	0
Ending balance	$ 16

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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