Segment Information - Operating Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 33,821	$ 33,330	$ 101,810	$ 99,107
Depreciation and amortization expense	4,618	4,458	13,830	13,386
Total Operating Expenses	25,716	27,404	77,555	77,842
Operating Income	8,105	5,926	24,255	21,265
Service
Segment Reporting Information [Line Items]
Cost of wireless equipment	6,863	7,193	20,691	21,064
Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	5,619	5,343	17,272	15,702
Cost of wireless equipment	6,483	6,047	19,596	17,519
Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	28,202	27,987	84,538	83,405
Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	3,247	3,230	9,687	9,646
Wireless service
Segment Reporting Information [Line Items]
Operating revenues	21,029	20,598	62,741	61,331
Consumer \| Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	2,937	2,916	8,757	8,708
Consumer \| Wireless service
Segment Reporting Information [Line Items]
Operating revenues	17,441	17,036	52,009	50,781
Business \| Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	310	314	930	938
Business \| Wireless service
Segment Reporting Information [Line Items]
Operating revenues	3,588	3,562	10,732	10,550
Operating Segments Excluding Intersegment Elimination \| Service
Segment Reporting Information [Line Items]
Operating revenues	20,260	19,864	60,439	59,232
Operating Segments Excluding Intersegment Elimination \| Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	4,766	4,478	14,667	13,111
Operating Segments Excluding Intersegment Elimination \| Other
Segment Reporting Information [Line Items]
Operating revenues	1,001	963	3,040	2,839
Operating Segments Excluding Intersegment Elimination \| Enterprise and Public Sector
Segment Reporting Information [Line Items]
Operating revenues	3,310	3,538	10,202	10,670
Operating Segments Excluding Intersegment Elimination \| Business Markets and Other
Segment Reporting Information [Line Items]
Operating revenues	3,345	3,258	9,991	9,647
Operating Segments Excluding Intersegment Elimination \| Wholesale
Segment Reporting Information [Line Items]
Operating revenues	479	547	1,488	1,684
Operating Segments Excluding Intersegment Elimination \| Consumer \| Service
Segment Reporting Information [Line Items]
Operating revenues	20,260	19,864	60,439	59,232
Operating Segments Excluding Intersegment Elimination \| Consumer \| Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	4,766	4,478	14,667	13,111
Operating Segments Excluding Intersegment Elimination \| Consumer \| Other
Segment Reporting Information [Line Items]
Operating revenues	1,001	963	3,040	2,839
Operating Segments Excluding Intersegment Elimination \| Consumer \| Enterprise and Public Sector
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Consumer \| Business Markets and Other
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Consumer \| Wholesale
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Business \| Service
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Business \| Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Business \| Other
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Operating Segments Excluding Intersegment Elimination \| Business \| Enterprise and Public Sector
Segment Reporting Information [Line Items]
Operating revenues	3,310	3,538	10,202	10,670
Operating Segments Excluding Intersegment Elimination \| Business \| Business Markets and Other
Segment Reporting Information [Line Items]
Operating revenues	3,345	3,258	9,991	9,647
Operating Segments Excluding Intersegment Elimination \| Business \| Wholesale
Segment Reporting Information [Line Items]
Operating revenues	479	547	1,488	1,684
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	86	63	247	188
Intersegment Eliminations \| Consumer
Segment Reporting Information [Line Items]
Operating revenues	78	55	225	162
Intersegment Eliminations \| Business
Segment Reporting Information [Line Items]
Operating revenues	8	8	22	26
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	33,247	32,711	100,074	97,371
Cost of wireless equipment	6,483	6,047	19,596	17,519
Centrally managed network and shared service costs	6,839	6,914	20,756	20,987
Depreciation and amortization expense	4,603	4,451	13,779	13,360
Other segment expenses	7,021	7,130	21,273	21,461
Total Operating Expenses	24,946	24,542	75,404	73,327
Operating Income	8,301	8,169	24,670	24,044
Operating Segments \| Consumer
Segment Reporting Information [Line Items]
Operating revenues	26,105	25,360	78,371	75,344
Cost of wireless equipment	5,270	4,850	15,988	14,032
Centrally managed network and shared service costs	4,456	4,397	13,448	13,277
Depreciation and amortization expense	3,568	3,411	10,693	10,114
Other segment expenses	5,147	5,098	15,511	15,341
Total Operating Expenses	18,441	17,756	55,640	52,764
Operating Income	7,664	7,604	22,731	22,580
Operating Segments \| Business
Segment Reporting Information [Line Items]
Operating revenues	7,142	7,351	21,703	22,027
Cost of wireless equipment	1,213	1,197	3,608	3,487
Centrally managed network and shared service costs	2,383	2,517	7,308	7,710
Depreciation and amortization expense	1,035	1,040	3,086	3,246
Other segment expenses	1,874	2,032	5,762	6,120
Total Operating Expenses	6,505	6,786	19,764	20,563
Operating Income	637	565	1,939	1,464
Operating Segments \| Business \| Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	853	865	2,600	2,600
Operating Segments \| Business \| Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	$ 6,300	$ 6,500	$ 19,100	$ 19,400

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