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Condensed Consolidated Financial Statement Details - Schedule of Settlement Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Settlement assets
Settlement deposits	$ 293	$ 353
Settlement receivables	200	126
Total Settlement assets	$ 493	$ 479

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- Definition

Settlement Assets

+ 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