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Schedule of Supplemental Cash Flow Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flow Supplemental Disclosures [Line Items]      
Interest paid, including on assumed debt $ 144us-gaap_InterestPaid $ 165us-gaap_InterestPaid $ 158us-gaap_InterestPaid
Income taxes paid from continuing operations 336us-gaap_IncomeTaxesPaidNet 299us-gaap_IncomeTaxesPaidNet 321us-gaap_IncomeTaxesPaidNet
Treasury stock purchases settled after the balance sheet date 19fisv_TreasuryStockPurchasesSettledAfterBalanceSheetDate 9fisv_TreasuryStockPurchasesSettledAfterBalanceSheetDate  
Liabilities assumed in acquisitions of businesses   $ 1,176us-gaap_LiabilitiesAssumed1