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Segment Information - Operating Financial Information for Reportable Segments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | $ 134,788 | $ 133,974 | $ 136,835
Depreciation and amortization expense | 17,892 | 17,624 | 17,099
Total Operating Expenses | 106,102 | 111,097 | 106,368
Operating Income | 28,686 | 22,877 | 30,467
Service |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services and wireless equipment | 27,997 | 28,100 | 28,637
Wireless equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 23,217 | 24,322 | 27,210
Cost of services and wireless equipment | 26,100 | 26,787 | 30,496
Service revenues and other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 111,571 | 109,652 | 109,625
Fios Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 12,899 | 12,849 | 12,823
Fios Revenues | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 11,647 | 11,614 | 11,622
Fios Revenues | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 1,252 | 1,235 | 1,201
Wireless Service |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 79,127 | 76,730 | 74,354
Wireless Service | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 65,374 | 63,358 | 61,509
Wireless Service | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 13,753 | 13,372 | 12,845
Operating Segments Excluding Intersegment Elimination | Service |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 76,880 | 74,874 | 73,139
Operating Segments Excluding Intersegment Elimination | Service | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 76,880 | 74,874 | 73,139
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 | 19,598 | 20,645 | 23,168
Operating Segments Excluding Intersegment Elimination | Wireless equipment | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 19,598 | 20,645 | 23,168
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 | 6,213 | 5,898 | 6,996
Operating Segments Excluding Intersegment Elimination | Other | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 6,213 | 5,898 | 6,996
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 | 14,218 | 15,076 | 15,692
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 | 14,218 | 15,076 | 15,692
Operating Segments Excluding Intersegment Elimination | Business Markets and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 13,081 | 12,697 | 12,753
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 | 13,081 | 12,697 | 12,753
Operating Segments Excluding Intersegment Elimination | Wholesale |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 2,196 | 2,313 | 2,584
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 | 2,196 | 2,313 | 2,584
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 249 | 245 | 246
Intersegment Eliminations | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 213 | 209 | 203
Intersegment Eliminations | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 36 | 36 | 43
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 132,435 | 131,748 | 134,578
Centrally managed network and shared service costs | 27,981 | 28,086 | 27,837
Depreciation and amortization expense | 17,859 | 17,565 | 17,028
Other segment expenses | 28,953 | 28,234 | 27,740
Total Operating Expenses | 100,893 | 100,671 | 103,101
Operating Income | 31,542 | 31,077 | 31,477
Operating Segments | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 102,904 | 101,626 | 103,506
Centrally managed network and shared service costs | 17,781 | 17,496 | 16,997
Depreciation and amortization expense | 13,552 | 13,077 | 12,716
Other segment expenses | 20,828 | 20,215 | 19,813
Total Operating Expenses | 73,420 | 72,615 | 74,660
Operating Income | 29,484 | 29,011 | 28,846
Operating Segments | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 29,531 | 30,122 | 31,072
Centrally managed network and shared service costs | 10,200 | 10,590 | 10,840
Depreciation and amortization expense | 4,307 | 4,488 | 4,312
Other segment expenses | 8,125 | 8,019 | 7,927
Total Operating Expenses | 27,473 | 28,056 | 28,441
Operating Income | 2,058 | 2,066 | 2,631
Operating Segments | Wireless equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services and wireless equipment | 26,100 | 26,786 | 30,496
Operating Segments | Wireless equipment | Consumer |  |  |
Segment Reporting Information [Line Items] |  |  |
Cost of services and wireless equipment | 21,259 | 21,827 | 25,134
Operating Segments | Wireless equipment | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | 3,600 | 3,700 | 4,000
Cost of services and wireless equipment | 4,841 | 4,959 | 5,362
Operating Segments | Service revenues and other | Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Revenues | $ 25,900 | $ 26,400 | $ 27,000

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