Line Of Credit Facility, Amortization Rate

No definition available.

Name:	fisv_LineOfCreditFacilityAmortizationRate
Namespace Prefix:	fisv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=fisv_FirstDataMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fisv_SeniorUnsecuredTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=fisv_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fisv_SeniorUnsecuredTermLoanFacilityLoansWithThreeYearMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fisv_SeniorUnsecuredTermLoanFacilityLoansWithFiveYearMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fisv_SeniorUnsecuredBridgeTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fisv_DebtInstrumentAmortizationPeriodAxis=fisv_DebtInstrumentAmortizationPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fisv_DebtInstrumentAmortizationPeriodAxis=fisv_DebtInstrumentAmortizationPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fisv_DebtInstrumentAmortizationPeriodAxis=fisv_DebtInstrumentAmortizationPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - Subsequent Event - USD ($) $ in Billions	Feb. 15, 2019	Jan. 16, 2019
First Data
Subsequent Event [Line Items]
Consideration transferred, equity value		$ 22.0
Line of Credit \| Senior Unsecured Term Loan Facility \| Term Loan Facility
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 5.0
Line of Credit \| Senior Unsecured Term Loan Facility, Loans With Three Year Maturity \| Term Loan Facility
Subsequent Event [Line Items]
Term	3 years
Maximum borrowing capacity	$ 1.5
Line of Credit \| Senior Unsecured Term Loan Facility, Loans With Five Year Maturity \| Term Loan Facility
Subsequent Event [Line Items]
Term	5 years
Maximum borrowing capacity	$ 3.5
Line of Credit \| Senior Unsecured Bridge Term Loan Facility \| Bridge Loan
Subsequent Event [Line Items]
Term		364 days
Maximum borrowing capacity		$ 17.0
Remaining borrowing capacity	$ 12.0
Debt Instrument, Amortization, Period One \| Line of Credit \| Senior Unsecured Term Loan Facility \| Term Loan Facility
Subsequent Event [Line Items]
Amortization rate	5.00%
Debt Instrument, Amortization, Period Two \| Line of Credit \| Senior Unsecured Term Loan Facility \| Term Loan Facility
Subsequent Event [Line Items]
Amortization rate	7.50%
Debt Instrument, Amortization, Period Three \| Line of Credit \| Senior Unsecured Term Loan Facility \| Term Loan Facility
Subsequent Event [Line Items]
Amortization rate	10.00%