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Other Financial Information - Other Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Unrecognized tax benefits | $ 477 | $ 453
Deferred revenue | 103 | 97
Operating lease liability | 51 | 49
Other | 76 | 86
Total Other liabilities | 707 | $ 685
Held-for-sale | Lumen Mass Markets fiber-to-the-home business |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Other non-current liabilities | $ 1 |

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