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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 |

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