Certain Employee Benefit and Stock Based Compensation Plans (Stock Option Rollforward) (Details) (Total Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance	10,898
Exercised	(2,871)
Cancelled	(228)
Outstanding, ending balance	7,799
Exercisable, Shares	7,560
Weighted-average exercise price, beginning of period	$ 87.75
Weighted-average exercise price, exercised	$ 59.49
Weighted-average exercise price, cancelled	$ 637
Weighted-average exercise price, end of period	$ 82.12
Exercisable, Weighted-average exercisable price of shares	$ 82.75
PNC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance	10,354
Exercised	(2,871)
Cancelled	(58)
Outstanding, ending balance	7,425
Exercisable, Shares	7,186
Weighted-average exercise price, beginning of period	$ 57.57
Weighted-average exercise price, exercised	$ 59.49
Weighted-average exercise price, cancelled	$ 52.93
Weighted-average exercise price, end of period	$ 56.86
Exercisable, Weighted-average exercisable price of shares	$ 56.69
PNC Options Converted From National City Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance	544
Cancelled	(170)
Outstanding, ending balance	374
Exercisable, Shares	374
Weighted-average exercise price, beginning of period	$ 662
Weighted-average exercise price, cancelled	$ 836
Weighted-average exercise price, end of period	$ 583
Exercisable, Weighted-average exercisable price of shares	$ 583