Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Increase in net unrealized gains(losses) on non-OTTI securities	$ (522)	$ 29	$ (329)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, before tax	12	25	24
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, before tax	(8)	(12)	16
Net increase (decrease), pre-tax	(526)	16	(369)
Effect of income taxes	121	(6)	135
Net unrealized gains (losses) on non-OTTI securities, Activity, After Tax	(405)	10	(234)
Net Unrealized Gains Losses On Otti Securities [Abstract]
Increase in net unrealized gains (losses) on OTTI securities, Pretax	(14)	173	61
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income		2
Less: OTTI losses realized on securities reclassified to noninterest income		(1)	(2)
Net unrealized gains (losses) on OTTI securities	(14)	172	63
Effect of income taxes	3	(63)	(23)
Net unrealized gains (losses) on OTTI securities, Activity, After Tax	(11)	109	40
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Increase in net unrealized gains (losses) on cash flow hedge derivatives	(118)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income	41
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income	11
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income	8
Net unrealized gains (losses) on cash flow hedge derivatives	(178)
Effect of income taxes	41
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(137)
Increase in net unrealized gains (losses) on cash flow hedge derivatives		(90)	100
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Before Tax		159	219
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Before Tax		21	34
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Before Tax		17
Net unrealized gains (losses) on cash flow hedge derivatives		(287)	(153)
Effect of income taxes		105	56
Net unrealized gains (losses) on cash flow hedge derivatives, Net of tax, Total		(182)	(97)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	10	126	(41)
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Before tax	5	47	50
Amortization of prior service cost (credit) reclassified to other noninterest expense, Before tax		(4)	(8)
Pension and other postretirement benefit plan adjustments, net activity, Pre-Tax	16	169	1
Effect of income taxes	(4)	(62)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	12	107	1
Other Comprehensive Income Other Adjustments [Abstract]
PNC's portion of BlackRock's OCI, Before tax	(55)	52	(63)
Net investment hedge derivatives, Before tax	76	(81)	186
Foreign Currency Transaction and Translation Adjustment, before Tax	(58)	90	(182)
Total Other, net activity, Before tax	(37)	61	(59)
Effect of income taxes	(5)	12	(46)
Total Other, net activity, After tax	(42)	73	(105)
Other Comprehensive Income (Loss), before Tax	(739)	131	(517)
Other Comprehensive Income (Loss), Tax	156	(14)	122
Other Comprehensive Income (Loss), Net of Tax	$ (583)	$ 117	$ (395)