Consolidated Statement Of Income (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 601,900,000		$ 555,300,000		$ 1,782,900,000		$ 1,628,000,000
Foreign Exchange Trading Income	44,000,000		87,200,000		165,300,000		252,800,000
Treasury Management Fees	16,300,000		17,800,000		51,000,000		55,100,000
Security Commissions and Trading Income	17,900,000		13,900,000		53,600,000		44,800,000
Other Operating Income	46,600,000		42,500,000		119,200,000		120,400,000
Investment security gains (losses), net	217,500	[1]	(2,000,000)	[1]	(1,700,000)	[1]	(24,100,000)	[1]
Total Noninterest Income	726,900,000		714,700,000		2,170,300,000		2,077,000,000
Net Interest Income
Interest Income	323,100,000		347,100,000		985,600,000		1,053,800,000
Interest Expense	77,500,000		90,300,000		229,500,000		316,500,000
Net Interest Income	245,600,000		256,800,000		756,100,000		737,300,000
Provision for Credit Losses	10,000,000		17,500,000		20,000,000		42,500,000
Net Interest Income after Provision for Credit Losses	235,600,000		239,300,000		736,100,000		694,800,000
Noninterest Expense
Compensation	315,700,000		311,100,000		951,100,000		925,300,000
Employee Benefits	61,300,000		66,700,000		194,300,000		188,700,000
Outside Services	126,600,000		139,700,000		388,500,000		398,600,000
Equipment and Software	86,000,000		76,300,000		276,200,000		232,800,000
Occupancy	43,800,000		45,400,000		128,200,000		131,300,000
Visa Indemnification Benefit							(10,100,000)
Other Operating Expense	63,000,000		62,000,000		199,000,000		192,900,000
Total Noninterest Expense	696,400,000		701,200,000		2,137,300,000		2,059,500,000
Income before Income Taxes	266,100,000		252,800,000		769,100,000		712,300,000
Provision for Income Taxes	87,300,000		82,400,000		249,500,000		238,900,000
Net Income	178,800,000		170,400,000		519,600,000		473,400,000
Net Income Applicable to Common Stock	$ 178,800,000		$ 170,400,000		$ 519,600,000		$ 473,400,000
Per Common Share
Net Income - Basic	$ 0.73		$ 0.70		$ 2.13		$ 1.94
Net Income - Diluted	$ 0.73		$ 0.70		$ 2.12		$ 1.93
Average Number of Common Shares Outstanding - Basic	240,237,014		240,991,491		240,740,803		241,529,793
Average Number of Common Shares Outstanding - Diluted	240,697,062		241,193,993		241,205,186		242,018,750

[1] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ 0.4 $ 0.5 $ (2.7 ) $ (1.1 ) Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI (0.6 ) (1.8 ) (0.6 ) (22.2 ) Other Security Gains (Losses), net 0.4 (0.7 ) 1.6 (0.8 ) Investment Security Gains (Losses), net $ 0.2 $ (2.0 ) $ (1.7 ) $ (24.1 )