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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill, less accumulated impairment losses | $ 5,650 | $ 6,955
Intangible assets, less accumulated amortization | 100 | 84
Goodwill, accumulated impairment losses | 2,405 | 2,405
Intangible assets, accumulated amortization | 1,648 | $ 1,841
Held-for-sale | Lumen Mass Markets fiber-to-the-home business |  |
Goodwill [Line Items] |  |
Goodwill | $ 1,305 |

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