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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 16, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Significant Accounting Policies Summary [Line Items]        
Stock split ratio 2us-gaap_StockholdersEquityNoteStockSplitConversionRatio1      
Increase in common stock value due to stock split $ 2,000,000fisv_StockIssuedDuringPeriodValueStockSplits      
Offsetting reduction in additional paid-in capital (2,000,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockSplit      
Applicable client support period for software maintenance fee revenue recognition, months   12 months    
Allowance for doubtful accounts   11,000,000us-gaap_AllowanceForDoubtfulAccountsReceivable 15,000,000us-gaap_AllowanceForDoubtfulAccountsReceivable  
Prepaid expenses   132,000,000us-gaap_PrepaidExpenseCurrent 122,000,000us-gaap_PrepaidExpenseCurrent  
Settlement assets   182,000,000us-gaap_SettlementAssetsCurrent 189,000,000us-gaap_SettlementAssetsCurrent  
Settlement obligations   176,000,000us-gaap_SettlementLiabilitiesCurrent 184,000,000us-gaap_SettlementLiabilitiesCurrent  
Depreciation expense   71,000,000us-gaap_Depreciation 70,000,000us-gaap_Depreciation 72,000,000us-gaap_Depreciation
Amortization expense for acquired intangible assets   204,000,000fisv_AmortizationOfAcquiredIntangibleAssets1 210,000,000fisv_AmortizationOfAcquiredIntangibleAssets1 160,000,000fisv_AmortizationOfAcquiredIntangibleAssets1
Product development expenditures as percentage of total revenue   9.00%fisv_ProductDevelopmentExpendituresAsPercentageOfRevenue 9.00%fisv_ProductDevelopmentExpendituresAsPercentageOfRevenue 9.00%fisv_ProductDevelopmentExpendituresAsPercentageOfRevenue
Non cash impairment charge associated with merger and integration     30,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived  
Goodwill impairment   0us-gaap_GoodwillImpairmentLoss    
Accumulated goodwill impairment   0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss    
Deferred financing costs   19,000,000us-gaap_DeferredFinanceCostsNet 24,000,000us-gaap_DeferredFinanceCostsNet  
Accumulated amortization, deferred financing costs   31,000,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts 26,000,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts  
Stock options excluded from the calculation of diluted weighted-average outstanding shares because their impact was anti-dilutive   1.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Open Solutions Inc        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Non cash impairment charge associated with merger and integration     30,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_BusinessAcquisitionAxis
= fisv_OpenSolutionsIncMember		  
Capitalized Software Development Costs        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   5 years    
Capitalized computer software, additions   129,000,000us-gaap_CapitalizedComputerSoftwareAdditions
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember		 120,000,000us-gaap_CapitalizedComputerSoftwareAdditions
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember		 102,000,000us-gaap_CapitalizedComputerSoftwareAdditions
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember
Capitalized computer software, amortization   82,000,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember		 72,000,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember		 73,000,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedSoftwareDevelopmentCostsMember
Purchased Software        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Amortization expense for intangible assets   29,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 32,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 34,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Acquired Intangible Assets        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Amortization expense for acquired intangible assets   204,000,000fisv_AmortizationOfAcquiredIntangibleAssets1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		 210,000,000fisv_AmortizationOfAcquiredIntangibleAssets1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		 160,000,000fisv_AmortizationOfAcquiredIntangibleAssets1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember
2015   190,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		    
2016   150,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		    
2017   140,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		    
2018   140,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		    
2019   130,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_AcquiredIntangibleAssetsMember		    
Capitalized And Purchased Software        
Schedule Of Significant Accounting Policies Summary [Line Items]        
2015   $ 115,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= fisv_CapitalizedAndPurchasedSoftwareMember		    
Minimum | Purchased Software        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   3 years    
Minimum | Customer Related Intangible Assets        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   10 years    
Minimum | Acquired Software and Technology        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   4 years    
Minimum | Trade Names        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   10 years    
Maximum        
Schedule Of Significant Accounting Policies Summary [Line Items]        
License revenue as a percentage of total revenue   4.00%fisv_LicenseRevenueAsPercentageOfRevenue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.00%fisv_LicenseRevenueAsPercentageOfRevenue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.00%fisv_LicenseRevenueAsPercentageOfRevenue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum | Purchased Software        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   5 years    
Maximum | Customer Related Intangible Assets        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   20 years    
Maximum | Acquired Software and Technology        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   8 years    
Maximum | Trade Names        
Schedule Of Significant Accounting Policies Summary [Line Items]        
Finite-lived intangible assets, useful life   20 years