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Goodwill, Customer Relationships and Other Intangible Assets - Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 0 |  | $ 1,964
Indefinite-lived intangible assets | 0 |  | 9
Total other intangible assets, net | 4,525 |  | 4,806
Held for sale | Mass Markets Fiber-to-the Home Business |  |  |
Goodwill [Line Items] |  |  |
Goodwill | (1,336) |  |
Customer Relationships |  |  |
Goodwill [Line Items] |  |  |
Other intangible assets subject to amortization | 2,899 |  | 3,196
Accumulated amortization | 4,648 |  | 4,504
Capitalized Software |  |  |
Goodwill [Line Items] |  |  |
Other intangible assets subject to amortization | 1,560 |  | 1,529
Accumulated amortization | 3,789 |  | 4,067
Patents and Other |  |  |
Goodwill [Line Items] |  |  |
Other intangible assets subject to amortization | 66 |  | 72
Accumulated amortization | $ 93 |  | $ 86
Fully Amortized and Retired Customer Relationships |  |  |
Goodwill [Line Items] |  |  |
Gross carrying value |  | $ 161 |
Fully Amortized and Retired Capitalized Software |  |  |
Goodwill [Line Items] |  |  |
Gross carrying value |  | $ 211 |

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