Parent Company (Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Revenues [Abstract]
Noninterest Income, Other Operating Income	$ 1,198	$ 1,124	$ 1,337
Operating Expenses [Abstract]
Income tax benefits	102	1,268	1,364
Other comprehensive income (loss), after tax and net of reclassifications into Net income	117	(395)	(373)
Comprehensive income attributable to PNC	5,455	3,508	3,733
Parent Company
Operating Revenues [Abstract]
Interest income	109	93	82
Noninterest Income, Other Operating Income	37	13	56
Total operating revenue	3,800	3,142	3,297
Operating Expenses [Abstract]
Interest expense	215	197	193
Other Expenses	175	109	89
Total operating expense	390	306	282
Income before income taxes and equity in undistributed net income of subsidiaries	3,410	2,836	3,015
Income tax benefits	(52)	(96)	(98)
Income Before Equity In Undistributed Net Income Of Subsidiaries	3,462	2,932	3,113
Equity In Undistributed Net Income Of Subsidiaries	1,974	971	993
Net income attributable to common shareholders	5,338	3,903	4,106
Net pension and other postretirement benefit plan activity arising during the period.	1	13	(3)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	1	13	(3)
Comprehensive income attributable to PNC	5,339	3,916	4,103
Parent Company | Bank Subsidiaries And Bank Holding Company
Operating Revenues [Abstract]
Dividends from	3,278	2,906	3,110
Operating Expenses [Abstract]
Equity In Undistributed Net Income Of Subsidiaries	1,974	818	736
Parent Company | Non Bank Subsidiaries
Operating Revenues [Abstract]
Dividends from	376	130	49
Operating Expenses [Abstract]
Equity In Undistributed Net Income Of Subsidiaries	$ (98)	$ 153	$ 257