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Litigation and contingencies - Summary (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Amount related to unreserved tax-related matters, inclusive of interest (up to) | $ 75

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- Definition Unreserved Tax Related Matters Inclusive of Interest + References No definition available. + Details
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Namespace Prefix: | uis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration