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Segment Information - Operating Financial Information for Reportable Segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Operating Revenues $ 133,974 $ 136,835 $ 133,613
Selling, general and administrative expense 32,745 30,136 28,658
Depreciation and amortization expense 17,624 17,099 16,206
Total Operating Expenses 111,097 106,368 101,165
Operating Income 22,877 30,467 32,448
Service      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 28,100 28,637 31,234
Wireless equipment      
Segment Reporting Information [Line Items]      
Operating Revenues 24,322 27,210 23,164
Cost of services and wireless equipment 26,787 30,496 25,067
Service revenues and other      
Segment Reporting Information [Line Items]      
Operating Revenues 109,652 109,625 110,449
Fios Revenues      
Segment Reporting Information [Line Items]      
Operating Revenues 12,849 12,823 12,694
Fios Revenues | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 11,614 11,622 11,558
Fios Revenues | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 1,235 1,201 1,136
Wireless Service      
Segment Reporting Information [Line Items]      
Operating Revenues 76,730 74,354 68,469
Wireless Service | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 63,358 61,509 56,103
Wireless Service | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 13,372 12,845 12,366
Operating Segments Excluding Intersegment Elimination | Service      
Segment Reporting Information [Line Items]      
Operating Revenues 74,874 73,139 67,723
Operating Segments Excluding Intersegment Elimination | Service | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 74,874 73,139 67,723
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 20,645 23,168 19,781
Operating Segments Excluding Intersegment Elimination | Wireless equipment | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 20,645 23,168 19,781
Operating Segments Excluding Intersegment Elimination | Wireless equipment | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 0 0 0
Operating Segments Excluding Intersegment Elimination | Other      
Segment Reporting Information [Line Items]      
Operating Revenues 5,898 6,996 7,568
Operating Segments Excluding Intersegment Elimination | Other | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 5,898 6,996 7,568
Operating Segments Excluding Intersegment Elimination | Other | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 0 0 0
Operating Segments Excluding Intersegment Elimination | Enterprise and Public Sector      
Segment Reporting Information [Line Items]      
Operating Revenues 15,076 15,692 16,387
Operating Segments Excluding Intersegment Elimination | Enterprise and Public Sector | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 0 0 0
Operating Segments Excluding Intersegment Elimination | Enterprise and Public Sector | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 15,076 15,692 16,387
Operating Segments Excluding Intersegment Elimination | Business Markets and Other      
Segment Reporting Information [Line Items]      
Operating Revenues 12,697 12,753 11,906
Operating Segments Excluding Intersegment Elimination | Business Markets and Other | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 0 0 0
Operating Segments Excluding Intersegment Elimination | Business Markets and Other | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 12,697 12,753 11,906
Operating Segments Excluding Intersegment Elimination | Wholesale      
Segment Reporting Information [Line Items]      
Operating Revenues 2,313 2,584 2,680
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 2,313 2,584 2,680
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Operating Revenues 245 246 297
Intersegment Eliminations | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 209 203 228
Intersegment Eliminations | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 36 43 69
Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenues 131,748 134,578 126,342
Selling, general and administrative expense 28,560 27,348 24,886
Depreciation and amortization expense 17,565 17,028 15,763
Total Operating Expenses 100,671 103,101 92,950
Operating Income 31,077 31,477 33,392
Operating Segments | Consumer      
Segment Reporting Information [Line Items]      
Operating Revenues 101,626 103,506 95,300
Selling, general and administrative expense 20,131 19,064 16,562
Depreciation and amortization expense 13,077 12,716 11,679
Total Operating Expenses 72,615 74,660 65,345
Operating Income 29,011 28,846 29,955
Operating Segments | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 30,122 31,072 31,042
Selling, general and administrative expense 8,429 8,284 8,324
Depreciation and amortization expense 4,488 4,312 4,084
Total Operating Expenses 28,056 28,441 27,605
Operating Income 2,066 2,631 3,437
Operating Segments | Service      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 27,760 28,229 27,234
Operating Segments | Service | Consumer      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 17,580 17,746 16,581
Operating Segments | Service | Business      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 10,180 10,483 10,653
Operating Segments | Wireless equipment      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 26,786 30,496 25,067
Operating Segments | Wireless equipment | Consumer      
Segment Reporting Information [Line Items]      
Cost of services and wireless equipment 21,827 25,134 20,523
Operating Segments | Wireless equipment | Business      
Segment Reporting Information [Line Items]      
Operating Revenues 3,700 4,000 3,400
Cost of services and wireless equipment 4,959 5,362 4,544
Operating Segments | Service revenues and other | Business      
Segment Reporting Information [Line Items]      
Operating Revenues $ 26,400 $ 27,000 $ 27,700