Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 5,418	$ 5,346	$ 5,388
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	1,465	(526)	16
Net unrealized gains (losses) on OTTI securities	24	(14)	172
Net unrealized gains (losses) on cash flow hedge derivatives	297	(178)
Net unrealized gains (losses) on cash flow hedge derivatives			(287)
Pension and other postretirement benefit plan adjustments	158	16	169
Other	22	(37)	61
Other comprehensive income (loss), before tax and net of reclassifications into Net income	1,966	(739)	131
Income tax benefit (expense) related to items of other comprehensive income	(442)	156	(14)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	1,524	(583)	117
Comprehensive income	6,942	4,763	5,505
Less: Comprehensive income attributable to noncontrolling interests	49	45	50
Comprehensive income attributable to PNC	$ 6,893	$ 4,718	$ 5,455