XML 122 R108.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Segments - Segments Results (Parenthetical) (Details) | Aug. 04, 2021 Item
--- | ---
Business Solutions | Asset Held for Sale, Not Discontinued Operations |
Segment Reporting Information [Line Items] |
Number of closings | 3

X
- 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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of closing included in the divestiture agreement. + References No definition available. + Details
Name: | wu_DisposalGroupIncludingDiscontinuedOperationNumberOfClosingInTransaction
Namespace Prefix: | wu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wu_BusinessSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |