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Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Rollforward of Allowance for Unfunded Loan Commitments and Letters of Credit) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance For Loan And Lease Losses [Abstract]      
Beginning balance $ 242pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit $ 250pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit $ 240pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit
Net change in allowance for unfunded loan commitments and letters of credit 17pnc_NetChangeInAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit (8)pnc_NetChangeInAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit 10pnc_NetChangeInAllowanceForUnfundedLoanCommitmentsAndLettersOfCredit
Ending balance $ 259pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit $ 242pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit $ 250pnc_AllowanceForUnfundedLoanCommitmentsAndLettersOfCredit