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Contingencies and Litigation - Gain Contingency (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Conduent Business Services, LLC v. Cognizant Business Service, LLC [Member] |
Gain Contingencies [Line Items] |
Gain Contingency, Unrecorded Amount | $ 150

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
Name: | us-gaap_GainContingencyUnrecordedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=cndt_ConduentBusinessServicesLLCv.CognizantBusinessServiceLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |