Loan Sale and Servicing Activities and Variable Interest Entities (Non-Consolidated VIEs) (Details) - Variable Interest Entity, Primary Beneficiary [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
PNC Risk of Loss	$ 18,405	$ 17,215
Carrying Value of Assets Owned by PNC	18,377	17,177
Carrying Value of Liabilities Owned by PNC	763	806
Mortgage-Backed Securitizations [Member]
PNC Risk of Loss	15,551	14,266
Carrying Value of Assets Owned by PNC	15,551	14,266
Tax Credit Investments And Other [Member]
PNC Risk of Loss	2,854	2,949
Carrying Value of Assets Owned by PNC	2,826	2,911
Carrying Value of Liabilities Owned by PNC	$ 763	$ 806

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685

+ Details

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Period Type:	instant

- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685

+ Details

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Period Type:	instant

- Definition

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_FinancialInstrumentAxis=pnc_MortgageBackedSecuritizationsMember
Namespace Prefix:
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Balance Type:
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- Details

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