Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,271	$ 1,239
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	639	(646)
Net unrealized gains (losses) on OTTI securities	9	14
Net unrealized gains (losses) on cash flow hedge derivatives	100	(193)
Pension and other postretirement benefit plan adjustments	145	63
Other	34	27
Other comprehensive income (loss), before tax and net of reclassifications into Net income	927	(735)
Income tax benefit (expense) related to items of other comprehensive income	(207)	178
Other comprehensive income (loss), after tax and net of reclassifications into Net income	720	(557)
Comprehensive income	1,991	682
Less: Comprehensive income (loss) attributable to noncontrolling interests	10	10
Comprehensive income attributable to PNC	$ 1,981	$ 672