Consolidated Statement Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Cash Flows from Operating Activities:
Net Income	$ 519,600,000		$ 473,400,000
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security (Gains) Losses, net	1,700,000	[1]	24,100,000	[1]
Amortization and Accretion of Securities and Unearned Income	(37,700,000)		(19,200,000)
Provision for Credit Losses	20,000,000		42,500,000
Depreciation on Buildings and Equipment	66,200,000		67,700,000
Qualified Pension Plan Contribution	(12,300,000)		(10,600,000)
Visa Indemnification Benefit			(10,100,000)
(Increase) Decrease in Receivables	(35,600,000)		104,500,000
Increase (Decrease) in Interest Payable	1,200,000		1,600,000
Net Change in Derivative Investments (Gains) Losses, net	(85,400,000)		(1,204,200,000)
Other Operating Activities, net	204,300,000		264,400,000
Net Cash Provided by (Used in) Operating Activities	791,200,000		(137,000,000)
Cash Flows from Investing Activities:
Net Increase in Federal Funds Sold and Securities Purchased under Agreements to Resell	(246,500,000)		(61,600,000)
Net Increase in Interest-Bearing Deposits with Banks	(2,651,400,000)		(3,592,800,000)
Net Decrease in Federal Reserve Deposits and Other Interest-Bearing Assets	7,218,100,000		4,438,000,000
Purchases of Securities - Held to Maturity	(1,210,700,000)		(101,500,000)
Proceeds from Maturity and Redemption of Securities - Held to Maturity	968,200,000		195,900,000
Purchases of Securities - Available for Sale	(16,885,100,000)		(24,888,100,000)
Proceeds from Sale, Maturity and Redemption of Securities - Available for Sale	19,155,800,000		16,484,000,000
Net Increase in Loans and Leases	(500,500,000)		(634,900,000)
Purchases of Buildings and Equipment, net	(27,900,000)		(55,100,000)
Purchases and Development of Computer Software	(149,400,000)		(219,800,000)
Net Change in Client Settlement Receivables and Payables	(299,900,000)		(246,900,000)
Decrease in Cash Due to Acquisitions, net of Cash Acquired			(172,600,000)
Other Investing Activities, net	(37,800,000)		(60,900,000)
Net Cash Provided by (Used in) Investing Activities	5,332,900,000		(8,916,300,000)
Cash Flows from Financing Activities:
Net Increase (Decrease) in Deposits	(5,745,900,000)		14,318,300,000
Net Decrease in Federal Funds Purchased	(241,700,000)		(2,953,900,000)
Net Decrease in Securities Sold under Agreements to Repurchase	(816,200,000)		(615,100,000)
Net Increase (Decrease) in Short-Term Other Borrowings	(367,400,000)		522,300,000
Proceeds from Term Federal Funds Purchased			7,959,900,000
Repayments of Term Federal Funds Purchased			(7,979,000,000)
Proceeds from Senior Notes and Long-Term Debt	500,000,000		500,000,000
Repayments of Senior Notes and Long-Term Debt	(722,700,000)		(879,800,000)
Treasury Stock Purchased	(99,900,000)		(77,700,000)
Net Proceeds from Stock Options	78,300,000		58,700,000
Cash Dividends Paid on Common Stock	(209,500,000)		(205,500,000)
Other Financing Activities, net	573,500,000
Net Cash Provided by (Used in) Financing Activities	(7,051,500,000)		10,648,200,000
Effect of Foreign Currency Exchange Rates on Cash	8,800,000		(76,300,000)
Increase (Decrease) in Cash and Due from Banks	(918,600,000)		1,518,600,000
Cash and Due from Banks at Beginning of Year	4,315,300,000		2,818,000,000
Cash and Due from Banks at End of Period	3,396,700,000		4,336,600,000
Supplemental Disclosures of Cash Flow Information:
Interest Paid	228,300,000		314,900,000
Income Taxes Paid	164,400,000		123,600,000
Transfers from Loans to OREO	36,300,000		57,500,000
Computer Software
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	134,200,000		117,400,000
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	$ 15,000,000		$ 11,500,000

[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 )