Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 5,346	$ 5,388	$ 3,985
Other comprehensive income (loss), before tax and net of reclassifications into Net income:
Net unrealized gains (losses) on non-OTTI securities	(526)	16	(369)
Net unrealized gains (losses) on OTTI securities	(14)	172	63
Net unrealized gains (losses) on cash flow hedge derivatives	(178)
Net unrealized gains (losses) on cash flow hedge derivatives		(287)	(153)
Pension and other postretirement benefit plan adjustments	16	169	1
Other	(37)	61	(59)
Other comprehensive income (loss), before tax and net of reclassifications into Net income	(739)	131	(517)
Income tax benefit (expense) related to items of other comprehensive income	156	(14)	122
Other comprehensive income (loss), after tax and net of reclassifications into Net income	(583)	117	(395)
Comprehensive income	4,763	5,505	3,590
Less: Comprehensive income attributable to noncontrolling interests	45	50	82
Comprehensive income attributable to PNC	$ 4,718	$ 5,455	$ 3,508