Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,400	$ 1,126	$ 3,995	$ 3,297
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	(324)	61	(1,125)	281
Net unrealized gains (losses) on OTTI securities	(1)	66	16	164
Net unrealized gains (losses) on cash flow hedge derivatives	(71)	(47)	(377)	(134)
Pension and other postretirement benefit plan adjustments	1	11	70	(6)
Other	(17)	6	(25)	32
Other comprehensive income (loss), before tax and net of reclassifications into Net income	(412)	97	(1,441)	337
Income tax benefit (expense) related to items of other comprehensive income	92	(21)	323	(94)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	(320)	76	(1,118)	243
Comprehensive income	1,080	1,202	2,877	3,540
Less: Comprehensive income (loss) attributable to noncontrolling interests	11	12	31	39
Comprehensive income attributable to PNC	$ 1,069	$ 1,190	$ 2,846	$ 3,501