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Employee Benefit Plans (Other Pension Assumptions) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Rate of compensation increase (average) 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Assumed health care cost trend rate Initial trend 7.50%pnc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedHealthCareCostTrendRateInitialTrend 7.75%pnc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedHealthCareCostTrendRateInitialTrend
Assumed health care cost trend rate Ultimate trend 5.00%pnc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedHealthCareCostTrendRateUltimateTrend 5.00%pnc_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationAssumedHealthCareCostTrendRateUltimateTrend
Assumed health care cost trend rate Year ultimate reached 2025 2025
Qualified Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.95%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Nonqualified Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.65%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 4.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember