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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
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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] + References No definition available. + Details
Name: | fis_SettlementAssetsAbstract
Namespace Prefix: | fis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Settlement Deposits, Current + References No definition available. + Details
Name: | fis_SettlementDepositsCurrent
Namespace Prefix: | fis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Receivables, Current + References No definition available. + Details
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. + References No definition available. + Details
Name: | us-gaap_SettlementAssetsCurrent
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. + References No definition available. + Details
Name: | us-gaap_SettlementLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant