Parent Company (Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Expenses [Abstract]
Income from continuing operations before income taxes and noncontrolling interests	$ 6,988	$ 3,429	$ 5,492
Income tax expense (benefit)	1,263	426	901
Net income from continuing operations	5,725	3,003	4,591
Income from discontinued operations before taxes		5,777	988
Income taxes from discontinued operations		1,222	161
Net income from discontinued operations		4,555	827
Net pension and other postretirement benefit plan activity arising during the period.	(372)	(63)	(122)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	(2,361)	1,971	1,524
Comprehensive income attributable to PNC	3,313	9,488	6,893
Discontinued Operations
Operating Expenses [Abstract]
Other comprehensive income (loss), after tax and net of reclassifications into Net income		115	4
Parent Company
Operating Revenues [Abstract]
Interest income	15	38	169
Noninterest income	41	37	48
Total operating revenue	4,460	14,121	4,077
Operating Expenses [Abstract]
Interest expense	129	179	325
Other expense	245	91	146
Total operating expense	374	270	471
Income before income taxes and equity in undistributed net income of subsidiaries	4,086	13,851	3,606
Equity in undistributed net income of subsidiaries:	1,628		1,363
Income from continuing operations before income taxes and noncontrolling interests	5,714	1,756	4,441
Income tax expense (benefit)	41	(1,206)	(101)
Net income from continuing operations	5,673	2,962	4,542
Income from discontinued operations before taxes		5,777	988
Income taxes from discontinued operations		1,222	161
Net income from discontinued operations		4,555	827
Net income	5,673	7,517	5,369
Net pension and other postretirement benefit plan activity arising during the period.	11	1	(2)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	11	1	(2)
Comprehensive income attributable to PNC	5,684	7,518	5,367
Parent Company | Bank Subsidiaries And Bank Holding Company
Operating Revenues [Abstract]
Dividends from	3,980	13,701	3,570
Operating Expenses [Abstract]
Equity in undistributed net income of subsidiaries:	1,085	(12,009)	671
Parent Company | Bank Subsidiaries And Bank Holding Company | Discontinued Operations
Operating Revenues [Abstract]
Dividends from		126	460
Operating Expenses [Abstract]
Equity in undistributed net income of subsidiaries:		5,651	528
Parent Company | Non Bank Subsidiaries
Operating Revenues [Abstract]
Dividends from	424	345	290
Operating Expenses [Abstract]
Equity in undistributed net income of subsidiaries:	$ 543	$ (86)	$ 164