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Settlement Assets and Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Settlement assets |  |
Cash and cash equivalents | $ 1,825 | $ 1,656
Receivables | 9,696 | 10,212
Total settlement assets | 11,521 | 11,868
Settlement obligations |  |
Payment instruments outstanding | 483 | 345
Card settlements due to merchants | 11,038 | 11,523
Total settlement obligations | $ 11,521 | $ 11,868

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

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

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- Definition Settlement Liabilities, Current, Card Settlements Due To Merchants + References No definition available. + Details
Name: | fisv_SettlementLiabilitiesCurrentCardSettlementsDueToMerchants
Namespace Prefix: | fisv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Settlement Liabilities, Current, Payment Instruments Outstanding + References No definition available. + Details
Name: | fisv_SettlementLiabilitiesCurrentPaymentInstrumentsOutstanding
Namespace Prefix: | fisv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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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