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Revenue Recognition - Customer Receivables and Contract Balances (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Jan. 01, 2025 | Dec. 31, 2024 | Jan. 01, 2024
--- | --- | --- | --- | ---
Capitalized Contract Cost [Line Items] |  |  |  |
Customer receivables, less allowance of $20 and $23 | $ 170 |  | $ 205 |
Contract liabilities | 231 | $ 244 | 244 | $ 269
Allowance for credit losses | 20 |  | $ 23 |
Held-for-sale | Lumen Mass Markets fiber-to-the-home business |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Customer receivables, less allowance of $20 and $23 | 12 |  |  |
Contract liabilities | $ 10 |  |  |

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