Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 915	$ 1,271
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on securities without an allowance for credit losses	1,487
Net unrealized gains (losses) on securities with an allowance for credit losses	(7)
Net unrealized gains (losses) on non-OTTI securities		639
Net unrealized gains (losses) on OTTI securities		9
Net unrealized gains (losses) on cash flow hedge derivatives	785	100
Pension and other postretirement benefit plan adjustments	12	145
Other	(26)	34
Other comprehensive income (loss), before tax and net of reclassifications into Net income	2,251	927
Income tax benefit (expense) related to items of other comprehensive income	(532)	(207)
Other comprehensive income (loss), after tax and net of reclassifications into Net income	1,719	720
Comprehensive income	2,634	1,991
Less: Comprehensive income attributable to noncontrolling interests	7	10
Comprehensive income attributable to PNC	$ 2,627	$ 1,981