Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Increase in net unrealized gains (losses) on non-OTTI securities	$ 203	$ (323)	$ 1,556	$ (1,129)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income	3	3	9	9
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income	4	(2)	18	(13)
Net increase (decrease), pre-tax	196	(324)	1,529	(1,125)
Effect of income taxes	(45)	73	(351)	259
Net increase (decrease), after-tax	151	(251)	1,178	(866)
Net Unrealized Gains Losses On Otti Securities [Abstract]
Increase in net unrealized gains (losses) on OTTI securities	18	(1)	27	16
Net increase (decrease), pre-tax	18	(1)	27	16
Effect of income taxes	(4)	1	(6)	(4)
Net increase (decrease), after-tax	14	0	21	12
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Increase in net unrealized gains (losses) on cash flow hedge derivatives	84	(62)	438	(317)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income	2	6	(18)	43
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income	3	2	5	9
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income		1	18	8
Net increase (decrease), pre-tax	79	(71)	433	(377)
Effect of income taxes	(18)	17	(99)	87
Net increase (decrease), after-tax	61	(54)	334	(290)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net pension and other postretirement benefit plan activity			54	66
Amortization of actuarial loss (gain) reclassified to other noninterest expense	1	1	6	3
Amortization of prior service cost (credit) reclassified to other noninterest expense	1		3	1
Net increase (decrease), pre-tax	2	1	63	70
Effect of income taxes			(14)	(16)
Net increase (decrease), after-tax	2	1	49	54
Other Comprehensive Income Other Adjustments [Abstract]
PNC’s portion of BlackRock’s OCI	(23)	(22)	(29)	(37)
Net investment hedge derivatives	36	17	50	47
Foreign currency translation adjustments and other	(32)	(12)	(36)	(35)
Net increase (decrease), pre-tax	(19)	(17)	(15)	(25)
Effect of income taxes	(3)	1	(5)	(3)
Net increase (decrease), after-tax	(22)	(16)	(20)	(28)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	276	(412)	2,037	(1,441)
Total other comprehensive income (loss), tax effect	(70)	92	(475)	323
Other comprehensive income (loss), after tax and net of reclassifications into Net income	$ 206	$ (320)	$ 1,562	$ (1,118)