Segment Information - Operating Financial Information for Reportable Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating Revenues	$ 136,835	$ 133,613	$ 128,292
Selling, general and administrative expense	30,136	28,658	31,573
Depreciation and amortization expense	17,099	16,206	16,720
Total Operating Expenses	106,368	101,165	99,494
Operating Income	30,467	32,448	28,798
Service
Segment Reporting Information [Line Items]
Cost of services and equipment	28,637	31,234	31,401
Wireless equipment
Segment Reporting Information [Line Items]
Operating Revenues	27,210	23,164	18,420
Cost of services and equipment	30,496	25,067	19,800
Wireless equipment | Business
Segment Reporting Information [Line Items]
Operating Revenues	4,000	3,400	2,900
Service revenues and other
Segment Reporting Information [Line Items]
Operating Revenues	109,625	110,449	109,872
Service revenues and other | Business
Segment Reporting Information [Line Items]
Operating Revenues	27,000	27,700	28,100
Fios Revenues
Segment Reporting Information [Line Items]
Operating Revenues	12,823	12,694	12,139
Fios Revenues | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	11,622	11,558	11,082
Fios Revenues | Business
Segment Reporting Information [Line Items]
Operating Revenues	1,201	1,136	1,057
Wireless Service
Segment Reporting Information [Line Items]
Operating Revenues	74,354	68,469	65,410
Wireless Service | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	61,509	56,103	53,605
Wireless Service | Business
Segment Reporting Information [Line Items]
Operating Revenues	12,845	12,366	11,805
Operating Segments Excluding Intersegment Elimination | Service
Segment Reporting Information [Line Items]
Operating Revenues	73,139	67,723	64,884
Operating Segments Excluding Intersegment Elimination | Service | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	73,139	67,723	64,884
Operating Segments Excluding Intersegment Elimination | Service | Business
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Wireless equipment
Segment Reporting Information [Line Items]
Operating Revenues	23,168	19,781	15,492
Operating Segments Excluding Intersegment Elimination | Wireless equipment | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	23,168	19,781	15,492
Operating Segments Excluding Intersegment Elimination | Wireless equipment | Business
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Other(1)
Segment Reporting Information [Line Items]
Operating Revenues	6,996	7,568	7,916
Operating Segments Excluding Intersegment Elimination | Other(1) | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	6,996	7,568	7,916
Operating Segments Excluding Intersegment Elimination | Other(1) | Business
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Small and Medium Business
Segment Reporting Information [Line Items]
Operating Revenues	12,595	11,751	11,112
Operating Segments Excluding Intersegment Elimination | Small and Medium Business | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Small and Medium Business | Business
Segment Reporting Information [Line Items]
Operating Revenues	12,595	11,751	11,112
Operating Segments Excluding Intersegment Elimination | Global Enterprise
Segment Reporting Information [Line Items]
Operating Revenues	9,733	10,218	10,405
Operating Segments Excluding Intersegment Elimination | Global Enterprise | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Global Enterprise | Business
Segment Reporting Information [Line Items]
Operating Revenues	9,733	10,218	10,405
Operating Segments Excluding Intersegment Elimination | Public Sector and Other
Segment Reporting Information [Line Items]
Operating Revenues	6,117	6,324	6,362
Operating Segments Excluding Intersegment Elimination | Public Sector and Other | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Public Sector and Other | Business
Segment Reporting Information [Line Items]
Operating Revenues	6,117	6,324	6,362
Operating Segments Excluding Intersegment Elimination | Wholesale
Segment Reporting Information [Line Items]
Operating Revenues	2,584	2,680	3,013
Operating Segments Excluding Intersegment Elimination | Wholesale | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0
Operating Segments Excluding Intersegment Elimination | Wholesale | Business
Segment Reporting Information [Line Items]
Operating Revenues	2,584	2,680	3,013
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	246	297	311
Intersegment Eliminations | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	203	228	241
Intersegment Eliminations | Business
Segment Reporting Information [Line Items]
Operating Revenues	43	69	70
Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	134,578	126,342	119,495
Selling, general and administrative expense	27,348	24,886	25,316
Depreciation and amortization expense	17,028	15,763	15,481
Total Operating Expenses	103,101	92,950	86,866
Operating Income	31,477	33,392	32,629
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Operating Revenues	103,506	95,300	88,533
Selling, general and administrative expense	19,064	16,562	16,936
Depreciation and amortization expense	12,716	11,679	11,395
Total Operating Expenses	74,660	65,345	59,677
Operating Income	28,846	29,955	28,856
Operating Segments | Business
Segment Reporting Information [Line Items]
Operating Revenues	31,072	31,042	30,962
Selling, general and administrative expense	8,284	8,324	8,380
Depreciation and amortization expense	4,312	4,084	4,086
Total Operating Expenses	28,441	27,605	27,189
Operating Income	2,631	3,437	3,773
Operating Segments | Service
Segment Reporting Information [Line Items]
Cost of services and equipment	28,229	27,234	26,269
Operating Segments | Service | Consumer
Segment Reporting Information [Line Items]
Cost of services and equipment	17,746	16,581	15,610
Operating Segments | Service | Business
Segment Reporting Information [Line Items]
Cost of services and equipment	10,483	10,653	10,659
Operating Segments | Wireless equipment
Segment Reporting Information [Line Items]
Cost of services and equipment	30,496	25,067	19,800
Operating Segments | Wireless equipment | Consumer
Segment Reporting Information [Line Items]
Cost of services and equipment	25,134	20,523	15,736
Operating Segments | Wireless equipment | Business
Segment Reporting Information [Line Items]
Cost of services and equipment	$ 5,362	$ 4,544	$ 4,064