Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,126	$ 1,006	$ 3,297	$ 2,938
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	61	(25)	281	752
Net unrealized gains (losses) on OTTI securities	66	38	164	17
Net unrealized gains (losses) on cash flow hedge derivatives	(47)	(125)	(134)	138
Pension and other postretirement benefit plan adjustments	11	11	(6)	26
Other	6	(25)	32	(40)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	97	(126)	337	893
Income tax benefit (expense) related to items of other comprehensive income	(21)	36	(94)	(377)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	76	(90)	243	516
Comprehensive income	1,202	916	3,540	3,454
Less: Comprehensive income (loss) attributable to noncontrolling interests	12	18	39	60
Comprehensive income attributable to PNC	$ 1,190	$ 898	$ 3,501	$ 3,394