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Litigation and contingencies (Details) $ in Millions	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Amount related to unreserved tax-related matters, inclusive of interest (up to)	$ 109

X

- Definition

Unreserved Tax Related Matters Inclusive of Interest

+ References

No definition available.

+ Details

Name:	uis_UnreservedTaxRelatedMattersInclusiveOfInterest
Namespace Prefix:	uis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration