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Loan Sale and Servicing Activities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Liability related to investments in low income housing tax credits | $ 1,100 | $ 600
Low Income Housing Tax Credit Investments |  |
Other Tax Benefits Recognized Low Income Housing Tax Credit Investments | 100 |
Cumulative effect of adopting ASU 2014-01 | Low Income Housing Tax Credit Investments |  |
Amortization Recognized Low Income Housing Tax Credit Investments | 200 |
Tax Credits Recognized Low Income Housing Tax Credit Investments | $ 200 |

X
- Definition Represents the amount of amortization recognized associated with the adoption of ASU 2014-01 + References No definition available. + Details
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Namespace Prefix: | pnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the liability related to investments in low income housing tax credits which is reflected in other liabilities on our Consolidated Balance Sheet. + References No definition available. + Details
Name: | pnc_LiabilityRelatedToInvestmentsInLowIncomeHousingTaxCredits
Namespace Prefix: | pnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of other tax benefits recognized associated with the adoption of ASU 2014-01 + References No definition available. + Details
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Namespace Prefix: | pnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of tax credits recognized associated with the adoption of ASU 2014-01 + 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Data Type: | na
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