Wireless Licenses, Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Beginning balance	$ 24,389
Reclassifications, adjustments and other	(7)
Ending balance	24,382
Goodwill accumulated impairment charge	4,800	$ 4,800
Operating Segments \| Consumer
Goodwill [Line Items]
Beginning balance	17,104
Reclassifications, adjustments and other	0
Ending balance	17,104
Operating Segments \| Business
Goodwill [Line Items]
Beginning balance	7,269
Reclassifications, adjustments and other	(7)
Ending balance	7,262
Other
Goodwill [Line Items]
Beginning balance	16
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.

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