Segment Information - Operating Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Operating revenues	$ 32,912	$ 33,554
Operating Income	7,584	7,796
Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	5,760	6,336
Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	27,152	27,218
Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	3,196	3,206
Wireless service
Segment Reporting Information [Line Items]
Operating revenues	18,889	18,342
Consumer | Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	2,889	2,911
Consumer | Wireless service
Segment Reporting Information [Line Items]
Operating revenues	15,599	15,217
Business | Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	882	962
Business | Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	6,600	6,700
Business | Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	307	295
Business | Wireless service
Segment Reporting Information [Line Items]
Operating revenues	3,290	3,125
Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Operating revenues	32,293	32,938
Operating Segments Excluding Intersegment Elimination | Consumer
Segment Reporting Information [Line Items]
Operating revenues	24,808	25,242
Operating Segments Excluding Intersegment Elimination | Consumer | Service
Segment Reporting Information [Line Items]
Operating revenues	18,456	18,126
Operating Segments Excluding Intersegment Elimination | Consumer | Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	4,878	5,374
Operating Segments Excluding Intersegment Elimination | Consumer | Other
Segment Reporting Information [Line Items]
Operating revenues	1,474	1,742
Operating Segments Excluding Intersegment Elimination | Business
Segment Reporting Information [Line Items]
Operating revenues	7,485	7,696
Operating Segments Excluding Intersegment Elimination | Business | Enterprise and Public Sector
Segment Reporting Information [Line Items]
Operating revenues	3,787	3,977
Operating Segments Excluding Intersegment Elimination | Business | Business Markets and SaaS
Segment Reporting Information [Line Items]
Operating revenues	3,099	3,072
Operating Segments Excluding Intersegment Elimination | Business | Wholesale
Segment Reporting Information [Line Items]
Operating revenues	599	647
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	58	63
Intersegment Eliminations | Consumer
Segment Reporting Information [Line Items]
Operating revenues	49	50
Intersegment Eliminations | Business
Segment Reporting Information [Line Items]
Operating revenues	9	13
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	32,351	33,001
Operating Income	7,650	7,992
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Operating revenues	24,857	25,292
Operating Income	7,099	7,319
Operating Segments | Business
Segment Reporting Information [Line Items]
Operating revenues	7,494	7,709
Operating Income	$ 551	$ 673