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Condensed Consolidated Financial Statement Details - Goodwill - Narrative (Details) | Dec. 31, 2020
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Merchant Solutions |
Goodwill [Line Items] |
Reporting unit, percentage of fair value in excess of carrying amount | 4.00%

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

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- Definition Percentage of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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