Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Net unrealized gains (losses) on non-OTTI securities, pretax, Beginning Balance	$ 1,096,000,000	$ 836,000,000	$ 1,022,000,000	$ 647,000,000
Net unrealized gains (losses) on non-OTTI securities, tax, Beginning Balance	(402,000,000)	(307,000,000)	(375,000,000)	(238,000,000)
Net unrealized gains (losses) on non-OTTI securities, after-tax, Beginning Balance	694,000,000	529,000,000	647,000,000	409,000,000
Increase in net unrealized gains (losses) on non-OTTI securities, Pretax	(346,000,000)	220,000,000	(214,000,000)	421,000,000
Increase in net unrealized gains (losses) on non-OTTI securities, Tax	128,000,000	(80,000,000)	79,000,000	(154,000,000)
Increase in net unrealized gains (losses) on non-OTTI securities, After tax	(218,000,000)	140,000,000	(135,000,000)	267,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, before tax	7,000,000	7,000,000	14,000,000	14,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, tax	(2,000,000)	(2,000,000)	(5,000,000)	(5,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, after tax	5,000,000	5,000,000	9,000,000	9,000,000
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, before tax	12,000,000	1,000,000	63,000,000	6,000,000
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, tax	(4,000,000)		(23,000,000)	(2,000,000)
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, after tax	8,000,000	1,000,000	40,000,000	4,000,000
Net unrealized gains (losses) on non-OTTI securities	(365,000,000)	212,000,000	(291,000,000)	401,000,000
Net unrealized gains (losses) on non-OTTI securities, Activity, Tax	134,000,000	(78,000,000)	107,000,000	(147,000,000)
Net unrealized gains (losses) on non-OTTI securities, Activity, After Tax	(231,000,000)	134,000,000	(184,000,000)	254,000,000
Net unrealized gains (losses) on non-OTTI securities, pretax, Ending Balance	731,000,000	1,048,000,000	731,000,000	1,048,000,000
Net unrealized gains (losses) on non-OTTI securities, tax, Ending Balance	(268,000,000)	(385,000,000)	(268,000,000)	(385,000,000)
Net unrealized gains (losses) on non-OTTI securities, after-tax, Ending Balance	463,000,000	663,000,000	463,000,000	663,000,000
Net Unrealized Gains Losses on Otti Securities [Abstract]
Net unrealized gains (losses) on OTTI securities, before tax, Beginning Balance	118,000,000	102,000,000	115,000,000	36,000,000
Net unrealized gains (losses) on OTTI securities, tax, Beginning Balance	(42,000,000)	(37,000,000)	(41,000,000)	(12,000,000)
Net unrealized gains (losses) on OTTI securities, after tax, Beginning Balance	76,000,000	65,000,000	74,000,000	24,000,000
Increase in net unrealized gains (losses) on OTTI securities, Pretax	3,000,000	40,000,000	5,000,000	104,000,000
Increase in net unrealized gains (losses) on OTTI securities, Tax	(1,000,000)	(14,000,000)	(2,000,000)	(38,000,000)
Increase in net unrealized gains (losses) on OTTI securities, After tax	2,000,000	26,000,000	3,000,000	66,000,000
Net other-than-temporary impairments	(1,000,000)	(1,000,000)	(2,000,000)	(3,000,000)
Less: Net OTTI losses realized in noninterest income, Tax	1,000,000		1,000,000	1,000,000
Less: Other OTTI losses realized in noninterest income, After-tax		(1,000,000)	(1,000,000)	(2,000,000)
Net unrealized gains (losses) on OTTI securities, Activity, Before Tax	4,000,000	41,000,000	7,000,000	107,000,000
Net unrealized gains (losses) on OTTI securities, Activity, Tax	(2,000,000)	(14,000,000)	(3,000,000)	(39,000,000)
Net unrealized gains (losses) on OTTI securities, Activity, After Tax	2,000,000	27,000,000	4,000,000	68,000,000
Net unrealized gains (losses) on OTTI securities, before tax, Ending Balance	122,000,000	143,000,000	122,000,000	143,000,000
Net unrealized gains (losses) on OTTI securities, tax, Ending Balance	(44,000,000)	(51,000,000)	(44,000,000)	(51,000,000)
Net unrealized gains (losses) on OTTI securities, after tax, Ending Balance	78,000,000	92,000,000	78,000,000	92,000,000
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Net unrealized gains (losses) on cash flow hedge derivatives, before tax, Beginning Balance	791,000,000	379,000,000	552,000,000	384,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, tax, Beginning balance	(290,000,000)	(139,000,000)	(202,000,000)	(141,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Beginning balance	501,000,000	240,000,000	350,000,000	243,000,000
Increase in net unrealized gains (losses) on cash flow hedge derivatives, Pretax	(102,000,000)	138,000,000	196,000,000	210,000,000
Increase in net unrealized gains (losses) on cash flow hedge derivatives, Tax	38,000,000	(50,000,000)	(72,000,000)	(76,000,000)
Increase in net unrealized gains (losses) on cash flow hedge derivatives, After tax	(64,000,000)	88,000,000	124,000,000	134,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Before Tax	64,000,000	61,000,000	128,000,000	130,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Tax	(24,000,000)	(23,000,000)	(47,000,000)	(48,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, After Tax	40,000,000	38,000,000	81,000,000	82,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Before Tax	8,000,000	3,000,000	12,000,000	6,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Tax	(3,000,000)	(1,000,000)	(5,000,000)	(2,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, After Tax	5,000,000	2,000,000	7,000,000	4,000,000
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Before Tax	(4,000,000)	(7,000,000)	(13,000,000)	(2,000,000)
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Tax	2,000,000	3,000,000	5,000,000	1,000,000
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, After Tax	(2,000,000)	(4,000,000)	(8,000,000)	(1,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, Before Tax	(170,000,000)	81,000,000	69,000,000	76,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, tax	63,000,000	(29,000,000)	(25,000,000)	(27,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, Net of tax, Total	(107,000,000)	52,000,000	44,000,000	49,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, before tax, Ending Balance	621,000,000	460,000,000	621,000,000	460,000,000
Net unrealized gains (losses) on cash flow hedge derivatives Ending balance, tax	(227,000,000)	(168,000,000)	(227,000,000)	(168,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Ending balance	394,000,000	292,000,000	394,000,000	292,000,000
Pension and other postretirement benefit plan adjustments [Abstract]
Pension and other postretirement benefit plan adjustments, before tax, Beginning Balance	(760,000,000)	(292,000,000)	(820,000,000)	(374,000,000)
Pension and other postretirement benefit plan adjustments, tax, Beginning Balance	278,000,000	107,000,000	300,000,000	137,000,000
Pension and other postretirement benefit plan adjustments, after tax, Beginning Balance	(482,000,000)	(185,000,000)	(520,000,000)	(237,000,000)
Net pension and other postretirement benefit plan activity, Before tax	(17,000,000)	10,000,000	36,000,000	93,000,000
Net pension and other postretirement benefit plan activity, Tax	7,000,000	(4,000,000)	(13,000,000)	(35,000,000)
Net pension and other postretirement benefit plan activity, After tax	(10,000,000)	6,000,000	23,000,000	58,000,000
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Before tax	9,000,000	1,000,000	18,000,000	2,000,000
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Tax	(4,000,000)	(1,000,000)	(7,000,000)	(1,000,000)
Amortization of actuarial loss (gain) reclassified to other noninterest expense, After tax	5,000,000		11,000,000	1,000,000
Amortization of prior service cost (credit) reclassified to other noninterest expense, Before tax	(2,000,000)	(2,000,000)	(4,000,000)	(4,000,000)
Amortization of prior service cost (credit) reclassified to other noninterest expense, Tax	1,000,000	1,000,000	2,000,000	2,000,000
Amortization of prior service cost (credit) reclassified to other noninterest expense, After tax	(1,000,000)	(1,000,000)	(2,000,000)	(2,000,000)
Pension and other postretirement benefit plan adjustments, net activity, Before tax	(10,000,000)	9,000,000	50,000,000	91,000,000
Pension and other postretirement benefit plan adjustments, net activity, Tax	4,000,000	(4,000,000)	(18,000,000)	(34,000,000)
Pension and other postretirement benefit plan adjustments, net activity, After Tax	(6,000,000)	5,000,000	32,000,000	57,000,000
Pension and other postretirement benefit plan adjustments, before tax, Ending Balance	(770,000,000)	(283,000,000)	(770,000,000)	(283,000,000)
Pension and other postretirement benefit plan adjustments Ending balance, tax	282,000,000	103,000,000	282,000,000	103,000,000
Pension and other postretirement benefit plan adjustments, after tax, Ending Balance	(488,000,000)	(180,000,000)	(488,000,000)	(180,000,000)
Other Comprehensive Income Other Adjustments [Abstract]
Other, pretax, Beginning Balance	(86,000,000)	(9,000,000)	(59,000,000)	(20,000,000)
Other, tax, Beginning Balance		16,000,000	11,000,000	17,000,000
Other, after tax, Beginning balance	(86,000,000)	7,000,000	(48,000,000)	(3,000,000)
PNC's portion of BlackRock's OCI, Before tax	(9,000,000)	(4,000,000)	(34,000,000)	7,000,000
PNC's portion of BlackRock's OCI, Tax	3,000,000	2,000,000	12,000,000	(2,000,000)
PNC's portion of BlackRock's OCI, After tax	(6,000,000)	(2,000,000)	(22,000,000)	5,000,000
Net investment hedge derivatives, Before tax	(65,000,000)	(26,000,000)	(11,000,000)	(33,000,000)
Net investment hedge derivatives, Tax	24,000,000	9,000,000	4,000,000	12,000,000
Net investment hedge derivatives, After tax	(41,000,000)	(17,000,000)	(7,000,000)	(21,000,000)
Foreign Currency Transaction and Translation Adjustment, before Tax	65,000,000	26,000,000	9,000,000	33,000,000
Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	65,000,000	26,000,000	9,000,000	33,000,000
Total Other, net activity, Before tax	(9,000,000)	(4,000,000)	(36,000,000)	7,000,000
Total Other, net activity, Tax	27,000,000	11,000,000	16,000,000	10,000,000
Total Other, net activity, After tax	18,000,000	7,000,000	(20,000,000)	17,000,000
Other, pretax, Ending Balance	(95,000,000)	(13,000,000)	(95,000,000)	(13,000,000)
Other, tax, Ending Balance	27,000,000	27,000,000	27,000,000	27,000,000
Other, after tax, Ending balance	$ (68,000,000)	$ 14,000,000	$ (68,000,000)	$ 14,000,000