Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Increase in net unrealized gains (losses) on non-OTTI securities	$ 713	$ (161)	$ 1,353	$ (806)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income	3	2	6	6
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income	16	(8)	14	(11)
Net increase (decrease), pre-tax	694	(155)	1,333	(801)
Effect of income taxes	(159)	36	(306)	186
Net increase (decrease), after-tax	535	(119)	1,027	(615)
Net Unrealized Gains Losses On Otti Securities [Abstract]
Increase in net unrealized gains (losses) on OTTI securities		3	9	17
Net increase (decrease), pre-tax		3	9	17
Effect of income taxes		(1)	(2)	(5)
Net increase (decrease), after-tax		2	7	12
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Increase in net unrealized gains (losses) on cash flow hedge derivatives	246		354
Increase in net unrealized gains (losses) on cash flow hedge derivatives		(94)		(255)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income	(12)		(20)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income		11		37
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income	1		2
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income		3		7
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income	3		18
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income		5		7
Net increase (decrease), pre-tax	254		354
Net increase (decrease), pre-tax	254	(113)	354	(306)
Effect of income taxes	(58)		(81)
Effect of income taxes		26		70
Net increase (decrease), after-tax	196		273
Net increase (decrease), after-tax	196	(87)		(236)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net pension and other postretirement benefit plan activity	(89)	5	54	66
Amortization of actuarial loss (gain) reclassified to other noninterest expense	4	1	5	2
Amortization of prior service cost (credit) reclassified to other noninterest expense	1		2	1
Net increase (decrease), pre-tax	(84)	6	61	69
Effect of income taxes	19	(1)	(14)	(16)
Net increase (decrease), after-tax	(65)	5	47	53
Other Comprehensive Income Other Adjustments [Abstract]
PNC’s portion of BlackRock’s OCI	(35)	(37)	(6)	(15)
Net investment hedge derivatives	32	69	14	30
Foreign currency translation adjustments and other	(27)	(67)	(4)	(23)
Net increase (decrease), pre-tax	(30)	(35)	4	(8)
Effect of income taxes		(7)	(2)	(4)
Net increase (decrease), after-tax	(30)	(42)	2	(12)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	834	(294)	1,761	(1,029)
Total other comprehensive income (loss), tax effect	(198)	53	(405)	231
Other comprehensive income (loss), after tax and net of reclassifications into Net income	$ 636	$ (241)	$ 1,356	$ (798)