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Stock Compensation Plans - Narrative (Details) $ in Millions	3 Months Ended
	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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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

X

- Details

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