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Contingencies and Litigation - Other Contingencies (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Surety Bond [Member]      
Guarantor Obligations [Line Items]      
Damages sought, multiplier of overpayment amount   $ 646,000,000  
Other contingencies letter of credits [Member]      
Guarantor Obligations [Line Items]      
Damages sought, multiplier of overpayment amount   344,000,000  
State Of Texas v. Xerox Corporation, Xerox State Healthcare, LLC, and ACS State Healthcare, LLC [Member]      
Guarantor Obligations [Line Items]      
Loss Contingency, Estimate of Possible Loss   110,000,000  
Loss Contingency, Damages Sought, Value   2,000,000,000  
Loss Contingency, Damages Sought, Multiplier Of Overpayment Amounts     3
Loss Contingency, New Claims Filed, Number 200,000    
Additional Accrual for Loss Contingency   72,000,000  
Conduent Business Services, LLC v. Cognizant Business Service, LLC [Member]      
Guarantor Obligations [Line Items]      
Gain Contingency, Unrecorded Amount $ 150,000,000   $ 150,000,000
Loss Contingency, Damages Sought, Value   47,000,000  
Loss on Contract Termination   $ 25,000,000  
Loss Contingency, New Claims Filed, Number   2