Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net Income	$ 734.5	$ 567.8
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses, net	0.3	3.3
Amortization and Accretion of Securities and Unearned Income, net	43.0	30.1
Provision for Credit Losses	(24.5)	3.0
Depreciation on Buildings and Equipment	67.4	68.0
Pension Plan Contributions	(16.5)	(13.9)
Change in Receivables	(13.3)	42.1
Change in Interest Payable	(5.9)	(2.9)
Change in Collateral With Derivative Counterparties, net	(165.7)	163.1
Other Operating Activities, net	(330.2)	230.3
Net Cash Provided by Operating Activities	483.8	1,273.5
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	(192.9)	(480.4)
Change in Interest-Bearing Deposits with Banks	238.7	3,498.1
Net Change in Federal Reserve Deposits	(4,865.7)	(8,416.5)
Purchases of Securities — Held to Maturity	(7,216.7)	(5,596.9)
Proceeds from Maturity and Redemption of Securities — Held to Maturity	5,288.3	3,505.4
Purchases of Securities — Available for Sale	(7,633.7)	(8,969.2)
Proceeds from Sale, Maturity and Redemption of Securities — Available for Sale	6,103.4	9,254.9
Change in Loans and Leases	(1,764.9)	(1,352.0)
Pension Plan Contributions	(55.3)	(51.0)
Purchases and Development of Computer Software	(229.0)	(235.2)
Change in Client Security Settlement Receivables	(364.2)	(181.8)
Other Investing Activities, net	181.4	(41.3)
Net Cash Used in Investing Activities	(10,510.6)	(9,065.9)
Cash Flows from Financing Activities:
Change in Deposits	10,940.6	8,556.6
Change in Federal Funds Purchased	(589.4)	(178.7)
Change in Securities Sold under Agreements to Repurchase	(400.6)	(50.5)
Change in Short-Term Other Borrowings	2,346.1	33.4
Repayments of Senior Notes and Long-Term Debt	(229.5)	(638.7)
Contingent Consideration Liability Payment	0.0	(55.3)
Proceeds from Issuance of Preferred Stock and Preference Stock	0.0	388.5
Treasury Stock Purchased	(344.4)	(315.2)
Net Proceeds from Stock Options	88.2	122.0
Cash Dividends Paid on Common Stock	(237.8)	(225.4)
Cash Dividends Paid on Preferred Stock	(21.2)	0.0
Other Financing Activities, net	17.4	(145.6)
Net Cash Provided by Financing Activities	11,569.4	7,491.1
Effect of Foreign Currency Exchange Rates on Cash	(107.3)	57.8
Increase in Cash and Due from Banks	1,435.3	(243.5)
Cash and Due from Banks at Beginning of Year	3,050.6	3,162.4
Cash and Due from Banks at End of Period	4,485.9	2,918.9
Supplemental Disclosures of Cash Flow Information:
Interest Paid	120.0	146.4
Income Taxes Paid	526.9	159.7
Transfers from Loans to OREO	10.4	10.0
Computer Software
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	185.9	167.9
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	$ 8.8	$ 14.7