Certain Employee Benefit and Stock Based Compensation Plans (Stock Option Rollforward) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Total Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance | shares	5,174
Exercised | shares	(49)
Cancelled | shares	(3)
Outstanding, ending balance | shares	5,122
Weighted-average exercise price, beginning of period | $ / shares	$ 77.47
Weighted-average exercise price, exercised | $ / shares	63.82
Weighted-average exercise price, cancelled | $ / shares	372.3
Weighted-average exercise price, end of period | $ / shares	$ 77.44
PNC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance | shares	4,931
Exercised | shares	(49)
Outstanding, ending balance | shares	4,882
Weighted-average exercise price, beginning of period | $ / shares	$ 55.5
Weighted-average exercise price, exercised | $ / shares	63.82
Weighted-average exercise price, end of period | $ / shares	$ 55.42
PNC Options Converted From National City Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning balance | shares	243
Cancelled | shares	(3)
Outstanding, ending balance | shares	240
Weighted-average exercise price, beginning of period | $ / shares	$ 522.54
Weighted-average exercise price, cancelled | $ / shares	372.3
Weighted-average exercise price, end of period | $ / shares	$ 524.27