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Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 12, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Fair value consideration |  | $ 45 |  | $ 45 |  | $ 37
Divested Business | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Total consideration | $ 1,200 |  |  |  |  |
Proceeds from divestiture of businesses | 1,000 |  |  |  |  |
Aggregate principal amount, consideration | 50 |  |  |  |  |
Aggregate principal amount, contingent consideration | 150 |  |  |  |  |
Fair value contingent consideration | $ 43 |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |  |
Initial period | 18 months |  |  |  |  |
Option to extend | 6 months |  |  |  |  |
Transition services agreement | $ 15 |  |  |  |  |
TSA services income |  | 7 | $ 9 | 25 | $ 9 |
Pass-through costs |  | 4 | 22 | 34 | 22 |
Revenue |  | 3 | 33 | 40 | 539 |
Gain (loss) on sale |  | 0 | 4 | (8) | 4 |
Cost of services, exclusive of depreciation and amortization |  | 3 | 33 | 40 | 387 |
Income tax expense (benefit) |  | 13 | 34 | 14 | 52 |
Divested Business | Discontinued Operations, Disposed of by Sale | Customer Care Commercial Services |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenue |  | 9 | 11 | 33 | 11 |
Divested Business | Discontinued Operations, Disposed of by Sale | Cloud Services Segments |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cost of services, exclusive of depreciation and amortization |  | $ 3 | $ 33 | $ 40 | $ 33 |
Divested Business | Fair Value | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Fair value consideration | $ 35 |  |  |  |  |

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