Parent Company (Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Revenues [Abstract]
Noninterest Income, Other Operating Income	$ 1,473	$ 1,205	$ 1,077
Operating Expenses [Abstract]
Income tax benefits	1,062	1,082	102
Other comprehensive income (loss), after tax and net of reclassifications into Net income	1,524	(583)	117
Comprehensive income attributable to PNC	6,893	4,718	5,455
Parent Company
Operating Revenues [Abstract]
Interest income	169	147	109
Noninterest Income, Other Operating Income	48	(1)	37
Total operating revenue	4,417	3,360	3,800
Operating Expenses [Abstract]
Interest expense	325	281	215
Other Expenses	146	139	175
Total operating expense	471	420	390
Income before income taxes and equity in undistributed net income of subsidiaries	3,946	2,940	3,410
Income tax benefits	(60)	(54)	(52)
Income Before Equity In Undistributed Net Income Of Subsidiaries	4,006	2,994	3,462
Equity In Undistributed Net Income Of Subsidiaries	1,363	2,307	1,974
Net income attributable to common shareholders	5,369	5,301	5,338
Net pension and other postretirement benefit plan activity arising during the period.	(2)	1	1
Other comprehensive income (loss), after tax and net of reclassifications into Net income	(2)	1	1
Comprehensive income attributable to PNC	5,367	5,302	5,339
Parent Company | Bank Subsidiaries And Bank Holding Company
Operating Revenues [Abstract]
Dividends from	4,030	3,057	3,278
Operating Expenses [Abstract]
Equity In Undistributed Net Income Of Subsidiaries	1,199	2,126	1,974
Parent Company | Non Bank Subsidiaries
Operating Revenues [Abstract]
Dividends from	170	157	376
Operating Expenses [Abstract]
Equity In Undistributed Net Income Of Subsidiaries	$ 164	$ 181	$ (98)