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Assets/Liabilities Held for Sale (Details) - Customer Care Contracts [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional Pre-tax loss on disposal and adjustment to final sales price	$ 12
Divestiture revenue	$ 36	$ 439

X

- Definition

Additional Pre-tax loss on disposal and adjustment to final sales price

+ References

No definition available.

+ Details

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- Definition

Divestiture revenue

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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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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- Details

Name:	dei_LegalEntityAxis=cndt_CustomerCareContractsMember
Namespace Prefix:
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Balance Type:
Period Type: