Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Increase in net unrealized gains(losses) on non-OTTI securities	$ (494)	$ 410	$ (1,122)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, before tax	27	31	39
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, before tax	48	4	50
Net unrealized gains (losses) on non-OTTI securities, Before Tax	(569)	375	(1,211)
OtherComprehensiveIncomeLossNonOttiSecuritiesAdjustmentTax	208	(137)	443
Net unrealized gains (losses) on non-OTTI securities, Activity, After Tax	(361)	238	(768)
Net Unrealized Gains Losses On Otti Securities [Abstract]
Increase in net unrealized gains (losses) on OTTI securities, Pretax	(17)	68	215
Less: Net OTTI losses realized in net income, Pre-tax	(4)	(11)	(16)
Net unrealized gains (losses) on OTTI securities	(13)	79	231
Net unrealized gains (losses) on cash flow hedge derivatives, tax	5	(29)	(84)
Net unrealized gains (losses) on OTTI securities, Activity, After Tax	(8)	50	147
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Increase in net unrealized gains (losses) on cash flow hedge derivatives, Pretax	415	431	(141)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Before Tax	270	251	284
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Before Tax	23	12	53
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Before Tax	(5)		49
Net unrealized gains (losses) on cash flow hedge derivatives, Before Tax	127	168	(527)
Net unrealized gains (losses) on cash flow hedge derivatives, tax	(47)	(61)	192
Net unrealized gains (losses) on cash flow hedge derivatives, Net of tax, Total	80	107	(335)
Pension and other postretirement benefit plan adjustments [Abstract]
Net pension and other postretirement benefit plan activity, Before tax	(82)	(440)	760
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Before tax	38	4	103
Pension and other postretirement benefit plan adjustments	(10)	(10)	(11)
Pension and other postretirement benefit plan adjustments, net activity, Before Tax	(54)	(446)	852
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	20	163	(312)
Pension and other postretirement benefit plan adjustments, net activity, After Tax	(34)	(283)	540
Other Comprehensive Income Other Adjustments [Abstract]
PNC's portion of BlackRock's OCI, Before tax	(39)	(36)	15
Net investment hedge derivatives, Before tax	60	54	(21)
Foreign Currency Transaction and Translation Adjustment, before Tax	(63)	(57)	27
Total Other, net activity, Before tax	(42)	(39)	21
Total Other, net activity, Tax	(8)	(6)	(3)
Total Other, net activity, After tax	(50)	(45)	18
Other Comprehensive Income Loss Before Tax	(551)	137	(634)
Other Comprehensive Income (Loss), Tax	178	(70)	236
Other comprehensive income (loss), net of tax	$ (373)	$ 67	$ (398)