Loans (Analysis of Changes in the Allowance for Credit Losses) (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Changes in the Allowance for Credit Losses [Roll Forward]
Portfolio changes	$ 196
Economics	496
Ending balance	$ 4,394

Financing Receivable And Off-Balance Sheet, Credit Loss, Allowance, Economic Forecast Changes

No definition available.

Name:	pnc_FinancingReceivableAndOffBalanceSheetCreditLossAllowanceEconomicForecastChanges
Namespace Prefix:	pnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration