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Other Financial Information - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Other Current Assets [Line Items] |  |  |  |
Capital expenditures included in accounts payable |  | $ 138 |  | $ 248
Gain on sale of investment | $ 205 | 0 | $ 205 |
Held for sale | Mass Markets Fiber-to-the Home Business |  |  |  |
Other Current Assets [Line Items] |  |  |  |
Accounts payable |  | $ 75 |  |

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