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Settlement Assets and Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Settlement assets |  |  |
Cash and cash equivalents | $ 1,756 | $ 1,756 | $ 2,283
Receivables | 13,673 | 25,925 |
Total settlement assets | $ 15,429 | $ 27,681 |

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- Definition Settlement Assets, Current, Cash And Cash Equivalents + References No definition available. + Details
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Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Settlement Assets, Current, Receivables + References No definition available. + Details
Name: | fi_SettlementAssetsCurrentReceivables
Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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