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Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Customer receivables, less allowance | $ 1,215 | $ 1,193
Contract assets | 30 | 19
Contract liabilities | 675 | 733
Allowance | 42 | $ 50
Held for sale | Mass Markets Fiber-to-the Home Business |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Customer receivables, less allowance | 13 |
Contract liabilities | $ 33 |

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