Employee Benefit Plans (Net Periodic Pension and Postretirement Benefits Costs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end balance	$ 4,357,000,000	$ 4,252,000,000
PNC Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	4,427,000,000	3,890,000,000
Projected benefit obligation at beginning of year	3,966,000,000	4,512,000,000
Service cost	103,000,000	113,000,000	101,000,000
Interest cost	187,000,000	170,000,000	191,000,000
Plan amendements	(7,000,000)
Actuarial (gains)/losses and changes in assumptions	504,000,000	(453,000,000)
Benefits paid	(254,000,000)	(376,000,000)
Projected benefit obligation at end of year	4,499,000,000	3,966,000,000	4,512,000,000
Fair value of plan assets, beginning balance	4,252,000,000	4,009,000,000
Actual return on plan assets	359,000,000	619,000,000
Fair value of plan assets, end balance	4,357,000,000	4,252,000,000	4,009,000,000
Funded status	(142,000,000)	286,000,000
Noncurrent asset		286,000,000
Noncurrent liability	(142,000,000)
Net amount recognized on the consolidated balance sheet	(142,000,000)	286,000,000
Prior service cost (credit)	(22,000,000)	(23,000,000)
Net actuarial loss	673,000,000	239,000,000
Amount recognized in AOCI	651,000,000	216,000,000
Nonqualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	316,000,000	287,000,000
Projected benefit obligation at beginning of year	292,000,000	362,000,000
Service cost	3,000,000	3,000,000	4,000,000
Interest cost	12,000,000	12,000,000	14,000,000
Actuarial (gains)/losses and changes in assumptions	40,000,000	(26,000,000)
Benefits paid	(25,000,000)	(20,000,000)
Settlement Payments		(39,000,000)
Projected benefit obligation at end of year	322,000,000	292,000,000	362,000,000
Employer contribution	25,000,000	59,000,000
Funded status	(322,000,000)	(292,000,000)
Current Liability	(31,000,000)	(28,000,000)
Noncurrent liability	(291,000,000)	(264,000,000)
Net amount recognized on the consolidated balance sheet	(322,000,000)	(292,000,000)
Prior service cost (credit)	1,000,000	1,000,000
Net actuarial loss	88,000,000	52,000,000
Amount recognized in AOCI	89,000,000	53,000,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	375,000,000	394,000,000
Service cost	5,000,000	6,000,000	5,000,000
Interest cost	16,000,000	14,000,000	16,000,000
Actuarial (gains)/losses and changes in assumptions	4,000,000	(9,000,000)
Participant contributions	8,000,000	13,000,000
Federal Medicare subsidy on benefits paid	2,000,000	2,000,000
Benefits paid	(31,000,000)	(34,000,000)
Settlement Payments		(11,000,000)
Projected benefit obligation at end of year	379,000,000	375,000,000	394,000,000
Employer contribution	21,000,000	30,000,000
Funded status	(379,000,000)	(375,000,000)
Current Liability	(25,000,000)	(29,000,000)
Noncurrent liability	(354,000,000)	(346,000,000)
Net amount recognized on the consolidated balance sheet	(379,000,000)	(375,000,000)
Prior service cost (credit)	(4,000,000)	(6,000,000)
Net actuarial loss	31,000,000	27,000,000
Amount recognized in AOCI	$ 27,000,000	$ 21,000,000