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Stock Compensation Plans - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Qualified Retirement Equity Program |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Accelerated stock compensation expense | $ 104

X
- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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Balance Type: | debit
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=fis_QualifiedRetirementEquityProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |