Legal Proceedings (Narrative) (Details) $ in Millions	Jun. 30, 2018 USD ($)
Legal Reserve [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss not accrued	$ 100
White Et Al V The PNC Financial Services Group [Member]
Loss Contingencies [Line Items]
Private Mortgage Insurance Premiums	219
Paid Claims Supporting Captive Reinsurance Arrangements	$ 12

Alleged total claims paid supporting captive reinsurance arrangements

No definition available.

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Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Alleged total amount of private mortgage insurance premiums (PMI) collected

+ References

No definition available.

+ Details

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Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LitigationCaseAxis=pnc_WhiteEtAlVPncFinancialServicesGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: