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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 5,873 | $ 5,676 | $ 5,733
Subsidy and other revenue | 64 | 75 | 54
Total revenue | 5,937 | 5,751 | 5,787
Revenue from contracts with customers, performance obligation | 962 |  |
Lease revenue | 52 | 62 | 63
Data And Internet Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,963 | 3,534 | 3,390
Voice Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,231 | 1,373 | 1,498
Video Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 344 | 430 | 520
Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 335 | 339 | 325
Consumer [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,163 | 3,097 | 3,116
Business And Wholesale [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 2,710 | $ 2,579 | $ 2,617

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