Total Equity and Other Comprehensive Income (Other Comprehensive Income) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Unrealized Gains Losses on Non Otti Securities [Abstract]
Net unrealized gains (losses) on non-OTTI securities, pretax, Beginning Balance	$ 1,048,000,000	$ 895,000,000	$ 647,000,000	$ 1,858,000,000
Net unrealized gains (losses) on non-OTTI securities, tax, Beginning Balance	(385,000,000)	(332,000,000)	(238,000,000)	(681,000,000)
Net unrealized gains (losses) on non-OTTI securities, after-tax, Beginning Balance	663,000,000	563,000,000	409,000,000	1,177,000,000
Increase in net unrealized gains (losses) on non-OTTI securities, Pretax	(125,000,000)	(77,000,000)	296,000,000	(963,000,000)
Increase in net unrealized gains (losses) on non-OTTI securities, Tax	46,000,000	31,000,000	(108,000,000)	352,000,000
Increase in net unrealized gains (losses) on non-OTTI securities, After tax	(79,000,000)	(46,000,000)	188,000,000	(611,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, before tax	7,000,000	(3,000,000)	21,000,000	22,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, tax	(3,000,000)	1,000,000	(8,000,000)	(8,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, after tax	4,000,000	(2,000,000)	13,000,000	14,000,000
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, before tax		(6,000,000)	6,000,000	46,000,000
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, tax		2,000,000	(2,000,000)	(17,000,000)
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, after tax		(4,000,000)	4,000,000	29,000,000
Net unrealized gains (losses) on non-OTTI securities	(132,000,000)	(68,000,000)	269,000,000	(1,031,000,000)
Net unrealized gains (losses) on non-OTTI securities, Activity, Tax	49,000,000	28,000,000	(98,000,000)	377,000,000
Net unrealized gains (losses) on non-OTTI securities, Activity, After Tax	(83,000,000)	(40,000,000)	171,000,000	(654,000,000)
Net unrealized gains (losses) on non-OTTI securities, pretax, Ending Balance	916,000,000	827,000,000	916,000,000	827,000,000
Net unrealized gains (losses) on non-OTTI securities, tax, Ending Balance	(336,000,000)	(304,000,000)	(336,000,000)	(304,000,000)
Net unrealized gains (losses) on non-OTTI securities, after-tax, Ending Balance	580,000,000	523,000,000	580,000,000	523,000,000
Net Unrealized Gains Losses on Otti Securities [Abstract]
Net unrealized gains (losses) on OTTI securities, before tax, Beginning Balance	143,000,000	(99,000,000)	36,000,000	(195,000,000)
Net unrealized gains (losses) on OTTI securities, tax, Beginning Balance	(51,000,000)	37,000,000	(12,000,000)	72,000,000
Net unrealized gains (losses) on OTTI securities, after tax, Beginning Balance	92,000,000	(62,000,000)	24,000,000	(123,000,000)
Increase in net unrealized gains (losses) on OTTI securities, Pretax	14,000,000	56,000,000	118,000,000	138,000,000
Increase in net unrealized gains (losses) on OTTI securities, Tax	(5,000,000)	(20,000,000)	(43,000,000)	(50,000,000)
Increase in net unrealized gains (losses) on OTTI securities, After tax	9,000,000	36,000,000	75,000,000	88,000,000
Net other-than-temporary impairments	(1,000,000)	(2,000,000)	(4,000,000)	(16,000,000)
Less: Net OTTI losses realized in net income, Tax	1,000,000	1,000,000	2,000,000	6,000,000
Less: Other OTTI losses realized in net income, After-tax		(1,000,000)	(2,000,000)	(10,000,000)
Net unrealized gains (losses) on OTTI securities, Activity, Before Tax	15,000,000	58,000,000	122,000,000	154,000,000
Net unrealized gains (losses) on OTTI securities, Activity, Tax	(6,000,000)	(21,000,000)	(45,000,000)	(56,000,000)
Net unrealized gains (losses) on OTTI securities, Activity, After Tax	9,000,000	37,000,000	77,000,000	98,000,000
Net unrealized gains (losses) on OTTI securities, before tax, Ending Balance	158,000,000	(41,000,000)	158,000,000	(41,000,000)
Net unrealized gains (losses) on OTTI securities, tax, Ending Balance	(57,000,000)	16,000,000	(57,000,000)	16,000,000
Net unrealized gains (losses) on OTTI securities, after tax, Ending Balance	101,000,000	(25,000,000)	101,000,000	(25,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract]
Net unrealized gains (losses) on cash flow hedge derivatives, before tax, Beginning Balance	460,000,000	523,000,000	384,000,000	911,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, tax, Beginning balance	(168,000,000)	(191,000,000)	(141,000,000)	(333,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Beginning balance	292,000,000	332,000,000	243,000,000	578,000,000
Increase in net unrealized gains (losses) on cash flow hedge derivatives, Pretax	(17,000,000)	75,000,000	193,000,000	(104,000,000)
Increase in net unrealized gains (losses) on cash flow hedge derivatives, Tax	6,000,000	(28,000,000)	(72,000,000)	38,000,000
Increase in net unrealized gains (losses) on cash flow hedge derivatives, After tax	(11,000,000)	47,000,000	121,000,000	(66,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Before Tax	61,000,000	63,000,000	191,000,000	216,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Tax	(22,000,000)	(23,000,000)	(70,000,000)	(79,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, After Tax	39,000,000	40,000,000	121,000,000	137,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Before Tax	3,000,000	16,000,000	9,000,000	49,000,000
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Tax	(1,000,000)	(6,000,000)	(4,000,000)	(18,000,000)
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, After Tax	2,000,000	10,000,000	5,000,000	31,000,000
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Before Tax		27,000,000	(2,000,000)	50,000,000
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Tax		(10,000,000)	0	(18,000,000)
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, After Tax		17,000,000	(2,000,000)	32,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, Before Tax	(81,000,000)	(31,000,000)	(5,000,000)	(419,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, tax	29,000,000	11,000,000	2,000,000	153,000,000
Net unrealized gains (losses) on cash flow hedge derivatives, Net of tax, Total	(52,000,000)	(20,000,000)	(3,000,000)	(266,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, before tax, Ending Balance	379,000,000	492,000,000	379,000,000	492,000,000
Net unrealized gains (losses) on cash flow hedge derivatives Ending balance, tax	(139,000,000)	(180,000,000)	(139,000,000)	(180,000,000)
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Ending balance	240,000,000	312,000,000	240,000,000	312,000,000
Pension and other postretirement benefit plan adjustments [Abstract]
Pension and other postretirement benefit plan adjustments, before tax, Beginning Balance	(283,000,000)	(1,173,000,000)	(374,000,000)	(1,226,000,000)
Pension and other postretirement benefit plan adjustments, tax, Beginning Balance	103,000,000	429,000,000	137,000,000	449,000,000
Pension and other postretirement benefit plan adjustments, after tax, Beginning Balance	(180,000,000)	(744,000,000)	(237,000,000)	(777,000,000)
Net pension and other postretirement benefit plan activity, Before tax		(1,000,000)	93,000,000	11,000,000
Net pension and other postretirement benefit plan activity, Tax			(35,000,000)	(4,000,000)
Net pension and other postretirement benefit plan activity, After tax		(1,000,000)	58,000,000	7,000,000
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Before tax	1,000,000	24,000,000	3,000,000	71,000,000
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Tax		(8,000,000)	(1,000,000)	(26,000,000)
Amortization of actuarial loss (gain) reclassified to other noninterest expense, After tax	1,000,000	16,000,000	2,000,000	45,000,000
Amortization of prior service cost (credit) reclassified to other noninterest expense, Before tax	(3,000,000)	(2,000,000)	(7,000,000)	(8,000,000)
Amortization of prior service cost (credit) reclassified to other noninterest expense, Tax	1,000,000	1,000,000	3,000,000	3,000,000
Amortization of prior service cost (credit) reclassified to other noninterest expense, After tax	(2,000,000)	(1,000,000)	(4,000,000)	(5,000,000)
Pension and other postretirement benefit plan adjustments, net activity, Before tax	(2,000,000)	21,000,000	89,000,000	74,000,000
Pension and other postretirement benefit plan adjustments, net activity, Tax	1,000,000	(7,000,000)	(33,000,000)	(27,000,000)
Pension and other postretirement benefit plan adjustments, net activity, After Tax	(1,000,000)	14,000,000	56,000,000	47,000,000
Pension and other postretirement benefit plan adjustments, before tax, Ending Balance	(285,000,000)	(1,152,000,000)	(285,000,000)	(1,152,000,000)
Pension and other postretirement benefit plan adjustments Ending balance, tax	104,000,000	422,000,000	104,000,000	422,000,000
Pension and other postretirement benefit plan adjustments, after tax, Ending Balance	(181,000,000)	(730,000,000)	(181,000,000)	(730,000,000)
Other Comprehensive Income Other Adjustments [Abstract]
Other, pretax, Beginning Balance	(13,000,000)	(54,000,000)	(20,000,000)	(41,000,000)
Other, tax, Beginning Balance	27,000,000	10,000,000	17,000,000	20,000,000
Other, after tax, Beginning balance	14,000,000	(44,000,000)	(3,000,000)	(21,000,000)
PNC's portion of BlackRock's OCI, Before tax	(10,000,000)	3,000,000	(3,000,000)	(8,000,000)
PNC's portion of BlackRock's OCI, Tax	4,000,000	8,000,000	2,000,000	(3,000,000)
PNC's portion of BlackRock's OCI, After tax	(6,000,000)	11,000,000	(1,000,000)	(11,000,000)
Net investment hedge derivatives, Before tax	51,000,000	(55,000,000)	18,000,000	1,000,000
Net investment hedge derivatives, Tax	(19,000,000)	21,000,000	(7,000,000)
Net investment hedge derivatives, After tax	32,000,000	(34,000,000)	11,000,000	1,000,000
Foreign Currency Transaction and Translation Adjustment, before Tax	(53,000,000)	55,000,000	(20,000,000)	(3,000,000)
Foreign Currency Translation Adjustment, Tax		(21,000,000)		1,000,000
Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(53,000,000)	34,000,000	(20,000,000)	(2,000,000)
Total Other, net activity, Before tax	(12,000,000)	3,000,000	(5,000,000)	(10,000,000)
Total Other, net activity, Tax	(15,000,000)	8,000,000	(5,000,000)	(2,000,000)
Total Other, net activity, After tax	(27,000,000)	11,000,000	(10,000,000)	(12,000,000)
Other, pretax, Ending Balance	(25,000,000)	(51,000,000)	(25,000,000)	(51,000,000)
Other, tax, Ending Balance	12,000,000	18,000,000	12,000,000	18,000,000
Other, after tax, Ending balance	$ (13,000,000)	$ (33,000,000)	$ (13,000,000)	$ (33,000,000)