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Reconciliation Between the Statutory U.S. Income Tax Rate and the Bancorp's Effective Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation Of Statutory Federal Tax Rate [Abstract]      
Statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax-exempt income (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Credits (8.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits (6.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Unrealized stock-based compensation benefits   0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 8.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other, net   0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 26.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 28.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations