Segment Information - Operating Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Operating revenues	$ 32,596	$ 33,789	$ 65,508	$ 67,343
Operating Income	7,220	7,552	14,804	15,348
Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	5,277	6,674	11,037	13,010
Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	27,319	27,115	54,471	54,333
Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	3,194	3,193	6,390	6,399
Wireless service
Segment Reporting Information [Line Items]
Operating revenues	19,113	18,418	38,002	36,760
Consumer | Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	2,886	2,895	5,775	5,806
Consumer | Wireless service
Segment Reporting Information [Line Items]
Operating revenues	15,762	15,236	31,361	30,453
Business | Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	847	966	1,700	1,900
Business | Service revenues and other
Segment Reporting Information [Line Items]
Operating revenues	6,600	6,700	13,200	13,400
Business | Fios revenues
Segment Reporting Information [Line Items]
Operating revenues	308	298	615	593
Business | Wireless service
Segment Reporting Information [Line Items]
Operating revenues	3,351	3,182	6,641	6,307
Operating Segments Excluding Intersegment Elimination
Segment Reporting Information [Line Items]
Operating revenues	31,981	33,168	64,274	66,106
Operating Segments Excluding Intersegment Elimination | Consumer
Segment Reporting Information [Line Items]
Operating revenues	24,506	25,553	49,314	50,795
Operating Segments Excluding Intersegment Elimination | Consumer | Service
Segment Reporting Information [Line Items]
Operating revenues	18,641	18,149	37,097	36,275
Operating Segments Excluding Intersegment Elimination | Consumer | Wireless equipment
Segment Reporting Information [Line Items]
Operating revenues	4,430	5,708	9,308	11,082
Operating Segments Excluding Intersegment Elimination | Consumer | Other
Segment Reporting Information [Line Items]
Operating revenues	1,435	1,696	2,909	3,438
Operating Segments Excluding Intersegment Elimination | Business
Segment Reporting Information [Line Items]
Operating revenues	7,475	7,615	14,960	15,311
Operating Segments Excluding Intersegment Elimination | Business | Enterprise and Public Sector
Segment Reporting Information [Line Items]
Operating revenues	3,784	3,867	7,571	7,844
Operating Segments Excluding Intersegment Elimination | Business | Business Markets and Other
Segment Reporting Information [Line Items]
Operating revenues	3,104	3,125	6,203	6,197
Operating Segments Excluding Intersegment Elimination | Business | Wholesale
Segment Reporting Information [Line Items]
Operating revenues	587	623	1,186	1,270
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	60	62	118	125
Intersegment Eliminations | Consumer
Segment Reporting Information [Line Items]
Operating revenues	52	51	101	101
Intersegment Eliminations | Business
Segment Reporting Information [Line Items]
Operating revenues	8	11	17	24
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	32,041	33,230	64,392	66,231
Operating Income	7,863	7,825	15,513	15,817
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Operating revenues	24,558	25,604	49,415	50,896
Operating Income	7,330	7,150	14,429	14,469
Operating Segments | Business
Segment Reporting Information [Line Items]
Operating revenues	7,483	7,626	14,977	15,335
Operating Income	$ 533	$ 675	$ 1,084	$ 1,348