Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Increase in net unrealized gains (losses) on non-OTTI securities	$ (323)	$ 68	$ (1,129)	$ 304
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income	3	10	9	20
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income	(2)	(3)	(13)	3
Net increase (decrease), pre-tax	(324)	61	(1,125)	281
Effect of income taxes	73	(20)	259	(103)
Net increase (decrease), after-tax	(251)	41	(866)	178
Net Unrealized Gains Losses On Otti Securities [Abstract]
Increase in net unrealized gains (losses) on OTTI securities	(1)	66	16	165
Less: OTTI losses realized on securities reclassified to noninterest income				(1)
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income				2
Net increase (decrease), pre-tax	(1)	66	16	164
Effect of income taxes	1	(22)	(4)	(60)
Net increase (decrease), after-tax	0	44	12	104
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Increase in net unrealized gains (losses) on cash flow hedge derivatives	(62)	(2)	(317)	15
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income	6	38	43	128
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income	2	5	9	16
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income	1	2	8	5
Net increase (decrease), pre-tax	(71)	(47)	(377)	(134)
Effect of income taxes	17	17	87	49
Net increase (decrease), after-tax	(54)	(30)	(290)	(85)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Net pension and other postretirement benefit plan activity			66	(38)
Amortization of actuarial loss (gain) reclassified to other noninterest expense	1	12	3	36
Amortization of prior service cost (credit) reclassified to other noninterest expense		(1)	1	(4)
Net increase (decrease), pre-tax	1	11	70	(6)
Effect of income taxes		(4)	(16)	2
Net increase (decrease), after-tax	1	7	54	(4)
Other Comprehensive Income Other Adjustments [Abstract]
PNC’s portion of BlackRock’s OCI	(22)	4	(37)	26
Net investment hedge derivatives	17	(26)	47	(76)
Foreign currency translation adjustments and other	(12)	28	(35)	82
Net increase (decrease), pre-tax	(17)	6	(25)	32
Effect of income taxes	1	8	(3)	18
Net increase (decrease), after-tax	(16)	14	(28)	50
Other comprehensive income (loss), before tax and net of reclassifications into Net income	(412)	97	(1,441)	337
Total other comprehensive income (loss), tax effect	92	(21)	323	(94)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	$ (320)	$ 76	$ (1,118)	$ 243

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-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563

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