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

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

X

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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