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Loan Sale and Servicing Activities and Variable Interest Entities Loan Sale and Servicing Activities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Billions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Low Income Housing Tax Credit Investments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amortization, tax credits, and other tax benefits recognized low income housing tax credit investments (less than) | $ 0.1 | $ 0.1

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- Definition Amortization, Tax Credits, And Other Tax Benefits Recognized Low Income Housing Tax Credit Investments + References No definition available. + Details
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Namespace Prefix: | pnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=pnc_LowIncomeHousingTaxCreditInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |