Employee Benefit Plans (Net Periodic Pension and Postretirement Benefits Costs) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning balance	$ 4,357,000,000
Fair value of plan assets, end balance	4,316,000,000	$ 4,357,000,000
PNC Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	4,330,000,000	4,427,000,000
Projected benefit obligation at beginning of year	4,499,000,000	3,966,000,000
Service cost	107,000,000	103,000,000	$ 113,000,000
Interest cost	177,000,000	187,000,000	170,000,000
Plan amendements		(7,000,000)
Actuarial (gains)/losses and changes in assumptions	(126,000,000)	504,000,000
Benefits paid	(260,000,000)	(254,000,000)
Projected benefit obligation at end of year	4,397,000,000	4,499,000,000	3,966,000,000
Fair value of plan assets, beginning balance	4,357,000,000	4,252,000,000
Actual return on plan assets	19,000,000	359,000,000
Employer contribution	200,000,000
Fair value of plan assets, end balance	4,316,000,000	4,357,000,000	4,252,000,000
Funded status	(81,000,000)	(142,000,000)
Noncurrent liability	(81,000,000)	(142,000,000)
Net amount recognized on the consolidated balance sheet	(81,000,000)	(142,000,000)
Prior service cost (credit)	(13,000,000)	(22,000,000)
Net actuarial loss	794,000,000	673,000,000
Amount recognized in AOCI	781,000,000	651,000,000
Nonqualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	292,000,000	316,000,000
Projected benefit obligation at beginning of year	322,000,000	292,000,000
Service cost	3,000,000	3,000,000	3,000,000
Interest cost	11,000,000	12,000,000	12,000,000
Actuarial (gains)/losses and changes in assumptions	(10,000,000)	40,000,000
Benefits paid	(28,000,000)	(25,000,000)
Projected benefit obligation at end of year	298,000,000	322,000,000	292,000,000
Employer contribution	28,000,000	25,000,000
Funded status	(298,000,000)	(322,000,000)
Current Liability	(27,000,000)	(31,000,000)
Noncurrent liability	(271,000,000)	(291,000,000)
Net amount recognized on the consolidated balance sheet	(298,000,000)	(322,000,000)
Prior service cost (credit)	1,000,000	1,000,000
Net actuarial loss	71,000,000	88,000,000
Amount recognized in AOCI	72,000,000	89,000,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	379,000,000	375,000,000
Service cost	5,000,000	5,000,000	6,000,000
Interest cost	15,000,000	16,000,000	14,000,000
Actuarial (gains)/losses and changes in assumptions	(9,000,000)	4,000,000
Participant contributions	5,000,000	8,000,000
Federal Medicare subsidy on benefits paid	2,000,000	2,000,000
Benefits paid	(28,000,000)	(31,000,000)
Settlement Payments	(1,000,000)
Projected benefit obligation at end of year	368,000,000	379,000,000	$ 375,000,000
Employer contribution	222,000,000	21,000,000
Fair value of plan assets, end balance	200,000,000
Funded status	(168,000,000)	(379,000,000)
Current Liability	(2,000,000)	(25,000,000)
Noncurrent liability	(166,000,000)	(354,000,000)
Net amount recognized on the consolidated balance sheet	(168,000,000)	(379,000,000)
Prior service cost (credit)	(3,000,000)	(4,000,000)
Net actuarial loss	22,000,000	31,000,000
Amount recognized in AOCI	$ 19,000,000	$ 27,000,000