Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 6,322
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	14,215
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	7,449
Available for Sale Securities, Amortized Cost, After 10 years	65,675
Securities available for sale debt securities, amortized cost	93,661	$ 67,790
Available-for-sale Securities, Fair value, 1 year or less	6,341
Available-for-sale Securities, Fair value, After 1 year through 5 years	14,801
Available-for-sale Securities, Fair value, After 5 years through 10 years	7,823
Available-for-sale Securities, Fair value, After 10 years	68,087
Available-for-sale Securities, Fair value, Total	$ 97,052	69,163
Weighted-average yield, GAAP basis, available for sale securities	2.62%
Held to Maturity Securities, Amortized Cost, 1 year or less	$ 18
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	601
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	426
Held to Maturity Securities, Amortized Cost, After 10 years	396
Held to maturity securities, amortized cost	1,441	17,661
Held-to-maturity Securities, Fair Value, 1 year or less	18
Held-to-maturity Securities, Fair Value, After 1 year through 5 years	638
Held-to-maturity Securities, Fair Value, After 5 years through 10 years	515
Held-to-maturity Securities, Fair Value, After 10 years	444
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$ 1,615	$ 18,044
Weighted-average yield, GAAP basis, held to maturity securities	3.30%
One Year or Less [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	0.75%
Weighted-average yield, GAAP basis, held to maturity securities	2.94%
After One Year Through Five Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.08%
Weighted-average yield, GAAP basis, held to maturity securities	3.23%
After Five Years Through Ten Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.12%
Weighted-average yield, GAAP basis, held to maturity securities	3.93%
After Ten Years [Member]
Debt Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.97%
Weighted-average yield, GAAP basis, held to maturity securities	2.66%
US Treasury and Government [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	$ 5,647
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	9,172
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	3,516
Available for Sale Securities, Amortized Cost, After 10 years	920
Securities available for sale debt securities, amortized cost	19,255
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	198
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	306
Held to Maturity Securities, Amortized Cost, After 10 years	281
Held to maturity securities, amortized cost	785
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	2
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	112
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,220
Available for Sale Securities, Amortized Cost, After 10 years	54,296
Securities available for sale debt securities, amortized cost	55,630
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 10 years	1,472
Securities available for sale debt securities, amortized cost	1,472
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	459
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	265
Available for Sale Securities, Amortized Cost, After 10 years	2,278
Securities available for sale debt securities, amortized cost	3,002
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	75
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	301
Available for Sale Securities, Amortized Cost, After 10 years	3,758
Securities available for sale debt securities, amortized cost	4,134
Asset backed [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	66
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	2,603
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,039
Available for Sale Securities, Amortized Cost, After 10 years	1,604
Securities available for sale debt securities, amortized cost	5,312
Other [Member]
Debt Securities [Line Items]
Available for Sale Securities, Amortized Cost, 1 year or less	607
Available for Sale Securities, Amortized Cost, After 1 year through 5 years	1,794
Available for Sale Securities, Amortized Cost, After 5 years through 10 years	1,108
Available for Sale Securities, Amortized Cost, After 10 years	1,347
Securities available for sale debt securities, amortized cost	4,856
Held to Maturity Securities, Amortized Cost, 1 year or less	18
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years	403
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years	120
Held to Maturity Securities, Amortized Cost, After 10 years	115
Held to maturity securities, amortized cost	$ 656

Represents the weighted-average yield by maturity for debt securities available for sale.

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Represents the weighted-average yield by maturity for debt held to maturity.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_InvestmentSecuritiesAxis=pnc_AfterOneYearThroughFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_InvestmentSecuritiesAxis=pnc_AfterFiveYearsThroughTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_InvestmentSecuritiesAxis=pnc_AfterTenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_AgencyandNonAgencyFinancialSecuritiesAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnc_AgencyandNonAgencyFinancialSecuritiesAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: