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Summary of Significant Accounting Policies - Schedule of Settlement Assets and Payables (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Settlement assets
Settlement deposits	$ 368	$ 353
Settlement receivables	147	126
Total Settlement assets	515	479
Settlement payables	$ 549	$ 500

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- Definition

Settlement Assets [Abstract]

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No definition available.

+ Details

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Namespace Prefix:	fis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Settlement Deposits, Current

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No definition available.

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Name:	fis_SettlementDepositsCurrent
Namespace Prefix:	fis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Settlement Receivables, Current

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No definition available.

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Name:	fis_SettlementReceivablesCurrent
Namespace Prefix:	fis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Cash received or short term receivables for unsettled money transfers, money orders, consumer payments, or business to business payments. Settlement assets include clearing and settling customers payments due to and from financial institutions and may include cash and cash equivalents.

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amounts payable for money transfers, money orders, and consumer payment service arrangements. Settlement liabilities include amounts payable to intermediaries for global payment transfers.

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No definition available.

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Name:	us-gaap_SettlementLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant