Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,392	$ 1,400	$ 4,037	$ 3,995
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	196	(324)	1,529	(1,125)
Net unrealized gains (losses) on OTTI securities	18	(1)	27	16
Net unrealized gains (losses) on cash flow hedge derivatives	79	(71)	433	(377)
Pension and other postretirement benefit plan adjustments	2	1	63	70
Other	(19)	(17)	(15)	(25)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	276	(412)	2,037	(1,441)
Income tax benefit (expense) related to items of other comprehensive income	(70)	92	(475)	323
Other comprehensive income (loss), after tax and net of reclassifications into Net income	206	(320)	1,562	(1,118)
Comprehensive income	1,598	1,080	5,599	2,877
Less: Comprehensive income attributable to noncontrolling interests	13	11	35	31
Comprehensive income attributable to PNC	$ 1,585	$ 1,069	$ 5,564	$ 2,846