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Other Financial Information - Other Current Assets, Net (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Prepaid Expenses and Other Current Assets [Abstract] |  |
Prepaid expenses | $ 370 | $ 372
Income tax receivable | 444 | 483
Materials, supplies and inventory | 163 | 146
Contract assets | 14 | 16
Other | 31 | 22
Total other current assets, net | 1,256 | 1,250
Held for sale | Mass Markets Fiber-to-the Home Business |  |
Other Current Assets [Line Items] |  |
Other current assets, net | 16 |
Acquisition Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | 106 | 102
Fulfillment Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | $ 128 | $ 109

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