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Leases and commitments - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |
Optional extension or renewal term (up to) | 5 years
Optional termination period | 1 year
Standby letters of credit and surety bonds outstanding | $ 198
Deposits and collateralized assets | $ 8
Minimum |
Lessee, Lease, Description [Line Items] |
Initial lease terms | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Initial lease terms | 8 years

X
- Definition Deposits And Collateralized Assets Amount + References No definition available. + Details
Name: | uis_DepositsAndCollateralizedAssetsAmount
Namespace Prefix: | uis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Operating and Finance Lease, Option to Terminate, Termination Period + References No definition available. + Details
Name: | uis_LesseeOperatingandFinanceLeaseOptiontoTerminateTerminationPeriod
Namespace Prefix: | uis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating and Finance Lease, Renewal Term + References No definition available. + Details
Name: | uis_LesseeOperatingandFinanceLeaseRenewalTerm
Namespace Prefix: | uis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating and Finance Lease, Term of Contract + References No definition available. + Details
Name: | uis_LesseeOperatingandFinanceLeaseTermofContract
Namespace Prefix: | uis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Letters Of Credit Outstanding And Surety Bonds Amount + References No definition available. + Details
Name: | uis_LettersOfCreditOutstandingAndSuretyBondsAmount
Namespace Prefix: | uis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |