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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

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