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Assets/Liabilities Held for Sale and Divestitures - Narrative (Details) - USD ($) $ in Millions |  |  | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 10, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Customer Care Contracts |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment of goodwill and long-lived assets |  |  |  |  | $ 66 |
Goodwill, write-off |  |  |  |  | 11 |
Long-lived assets, write-off |  |  |  |  | 11 |
Divestiture revenue |  |  |  |  | $ 439 | $ 483
Local And Municipal Constituent Government Software Solutions Business |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture revenue |  |  |  | $ 81 |  | 113
Proceeds from divestitures and sale of assets, net of cash | $ 106 |  |  |  |  |
Gain on sale of business | 0 |  |  |  |  |
Human Resource Services |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture revenue |  |  |  | 172 |  | 279
Proceeds from divestitures and sale of assets, net of cash | 168 |  |  |  |  |
Gain on sale of business |  | $ 7 |  |  |  |
Proceeds collected in installments | 20 |  |  |  |  |
Contingent consideration from divestiture |  | 6 |  |  |  |
Intercompany divestiture revenue |  |  |  | 6 |  |
Off-Street Parking |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture revenue |  |  |  | $ 18 |  | 42
Proceeds from divestitures and sale of assets, net of cash | $ 26 |  |  |  |  |
Gain on sale of business |  | 8 |  |  |  |
Commercial Vehicle Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Divestiture revenue |  |  | $ 33 |  |  | $ 66
Proceeds from divestitures and sale of assets, net of cash |  | 403 |  |  |  |
Gain on sale of business |  | 77 |  |  |  |
Adjustment to divestiture proceeds and pre-tax gain |  | $ 3 |  |  |  |

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