Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 3,108,100,000	$ 2,980,500,000	$ 2,832,800,000
Foreign Exchange Trading Income	236,600,000	261,800,000	210,100,000
Treasury Management Fees	62,800,000	64,700,000	66,000,000
Security Commissions and Trading Income	81,400,000	78,700,000	67,600,000
Other Operating Income	241,200,000	247,100,000	153,500,000
Investment Security Losses, net	(3,200,000)	(300,000)	(4,300,000)
Total Noninterest Income	3,726,900,000	3,632,500,000	3,325,700,000
Net Interest Income
Interest Income	1,416,900,000	1,224,000,000	1,186,900,000
Interest Expense	182,000,000	153,900,000	181,400,000
Net Interest Income	1,234,900,000	1,070,100,000	1,005,500,000
Provision for Credit Losses	(26,000,000)	(43,000,000)	6,000,000
Net Interest Income after Provision for Credit Losses	1,260,900,000	1,113,100,000	999,500,000
Noninterest Expense
Compensation	1,541,100,000	1,443,300,000	1,417,900,000
Employee Benefits	293,300,000	285,300,000	268,700,000
Outside Services	627,100,000	595,700,000	574,600,000
Equipment and Software	467,400,000	454,800,000	421,400,000
Occupancy	177,400,000	173,500,000	180,300,000
Other Operating Expense	364,400,000	328,000,000	272,100,000
Total Noninterest Expense	3,470,700,000	3,280,600,000	3,135,000,000
Income before Income Taxes	1,517,100,000	1,465,000,000	1,190,200,000
Provision for Income Taxes	484,600,000	491,200,000	378,400,000
NET INCOME	1,032,500,000	973,800,000	811,800,000
Preferred Stock Dividends	23,400,000	23,400,000	9,500,000
Net Income Applicable to Common Stock	$ 1,009,100,000	$ 950,400,000	$ 802,300,000
PER COMMON SHARE
Net Income - Basic (in dollars per share)	$ 4.35	$ 4.03	$ 3.34
Net Income - Diluted (in dollars per share)	$ 4.32	$ 3.99	$ 3.32
Average Number of Common Shares Outstanding - Basic	227,580,584	232,279,849	235,829,790
Average Number of Common Shares Outstanding - Diluted	229,151,406	234,221,729	237,720,255
Note: Changes in Other-Than-Temporary-Impairment (OTTI) Losses	$ (3,700,000)	$ 0	$ (4,900,000)
Noncredit-related OTTI Losses Recorded in (Reclassified from) OCI	0	0	700,000
Other Security Gains/(Losses), net	500,000	(300,000)	(100,000)
Investment Security Losses, net	$ (3,200,000)	$ (300,000)	$ (4,300,000)