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Contingencies and Litigation - Loss Contingency (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
claim
State Of Texas v. Xerox Corporation, Xerox State Healthcare, LLC, and ACS State Healthcare, LLC [Member]    
Loss Contingencies [Line Items]    
loss contingencies, settlement amount $ 236  
Loss Contingency, Damages Paid, Value 40  
loss contingencies, agreed upon settlement amount to be paid within 1 month 78  
loss contingencies, agreed upon settlement amount to be paid within 1 year 118  
Loss Contingency, Loss in Period 13  
Conduent Business Services, LLC v. Cognizant Business Service, LLC [Member]    
Loss Contingencies [Line Items]    
Loss Contingency, New Claims Filed, Number | claim   2
Loss Contingency, Damages Sought, Value   $ 47
Loss on Contract Termination   $ 25
Contractual and Corporate Obligations Guarantee [Member]    
Loss Contingencies [Line Items]    
Maximum exposure, undiscounted 266  
Surety Bond [Member]    
Loss Contingencies [Line Items]    
Maximum exposure, undiscounted $ 636