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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