Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,374	$ 1,356	$ 2,645	$ 2,595
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	694	(155)	1,333	(801)
Net unrealized gains (losses) on OTTI securities		3	9	17
Net unrealized gains (losses) on cash flow hedge derivatives	254	(113)	354	(306)
Pension and other postretirement benefit plan adjustments	(84)	6	61	69
Other	(30)	(35)	4	(8)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	834	(294)	1,761	(1,029)
Income tax benefit (expense) related to items of other comprehensive income	(198)	53	(405)	231
Other comprehensive income (loss), after tax and net of reclassifications into Net income	636	(241)	1,356	(798)
Comprehensive income	2,010	1,115	4,001	1,797
Less: Comprehensive income attributable to noncontrolling interests	12	10	22	20
Comprehensive income attributable to PNC	$ 1,998	$ 1,105	$ 3,979	$ 1,777