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Allowances for Loan and Lease Losses (Narrative) (Details) - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance For Loan And Lease Losses [Abstract] |  |  |
Net interest income less the provision for credit losses | $ 9.2 | $ 9.3 | $ 8.7

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- Definition Allowance For Loan And Lease Losses + References No definition available. + Details
Name: | pnc_AllowanceForLoanAndLeaseLossesAbstract
Namespace Prefix: | pnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.12) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration