Income Taxes (IRS Tax Examination Status) (Details) - Internal Revenue Service (IRS) - Under Exam	12 Months Ended
Dec. 31, 2019
Income Tax Examination Earliest Year Under Examination	2016
Income Tax Examination Latest Year Under Examination	2017

Earliest tax year being audited in the income tax examination, in CCYY format.

No definition available.

Name:	pnc_IncomeTaxExaminationEarliestYearUnderExamination
Namespace Prefix:	pnc_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration