Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,244	$ 1,310
Aggregate unpaid principal balance of assets for which fair value option was elected	1,485	1,568
Fair value option aggregate difference assets	(241)	(258)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	68	80
Aggregate unpaid principal balance of assets for which fair value option was elected	75	80
Fair value option aggregate difference assets	(7)
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	37	31
Aggregate unpaid principal balance, other borrowed funds	38	32
Difference, Other borrowed funds	(1)	(1)
Other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	141	196
Difference, Other borrowed funds	141	196
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	505	509
Aggregate unpaid principal balance of assets for which fair value option was elected	518	521
Fair value option aggregate difference assets	(13)	(12)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	140	155
Aggregate unpaid principal balance of assets for which fair value option was elected	152	167
Fair value option aggregate difference assets	(12)	(12)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	599	646
Aggregate unpaid principal balance of assets for which fair value option was elected	815	880
Fair value option aggregate difference assets	(216)	(234)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	529	654
Aggregate unpaid principal balance of assets for which fair value option was elected	546	687
Fair value option aggregate difference assets	(17)	(33)
Residential mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	486	609
Aggregate unpaid principal balance of assets for which fair value option was elected	496	633
Fair value option aggregate difference assets	(10)	(24)
Residential mortgage loans held for sale \| Accruing loans 90 days or more past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	10	5
Aggregate unpaid principal balance of assets for which fair value option was elected	10	5
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	33	40
Aggregate unpaid principal balance of assets for which fair value option was elected	40	49
Fair value option aggregate difference assets	(7)	(9)
Commercial mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	379	276
Aggregate unpaid principal balance of assets for which fair value option was elected	411	300
Fair value option aggregate difference assets	(32)	(24)
Commercial mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	365	261
Aggregate unpaid principal balance of assets for which fair value option was elected	368	256
Fair value option aggregate difference assets	(3)	5
Commercial mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	14	15
Aggregate unpaid principal balance of assets for which fair value option was elected	43	44
Fair value option aggregate difference assets	$ (29)	$ (29)

Represents the aggregate unpaid principal balance of assets for which the fair value option was elected.

No definition available.

Name:	pnc_AggregateUnpaidPrincipalBalanceOfItemsForWhichFairValueOptionWasElectedAssets
Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the aggregate unpaid principal balance of liabilities for which the fair value option was elected.

+ References

No definition available.

+ Details

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

- Definition

Represents the fair value of assets for which the fair value option was elected.

+ References

No definition available.

+ Details

Name:	pnc_FairValueOfItemsForWhichFairValueOptionWasElectedAssets
Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the fair value of liabilities for which the fair value option was elected.

+ References

No definition available.

+ Details

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

- Definition

For assets for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets.

+ References

No definition available.

+ Details

Name:	pnc_FairValueOptionAggregateDifferenceAssets
Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For liabilities for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets.

+ References

No definition available.

+ Details

Name:	pnc_FairValueOptionAggregateDifferenceLiabilities
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_LoansReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=pnc_OtherAssetsFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=pnc_OtherBorrowedFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_FairValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItem2Axis=pnc_LoansLessThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_FairValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItem2Axis=pnc_Loans90DaysOrMorePastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_FairValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItem2Axis=pnc_NonaccrualLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_FairValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroup2Axis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=pnc_LoansHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_FairValueOptionQualitativeDisclosuresRelatedToElectionByEligibleItemOrGroup2Axis=pnc_CommercialMortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: