Consolidated Statements of Cash Flows (Unaudited - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net Income	$ 276.1	$ 245.4
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses (Gains), net	0.3	(0.3)
Amortization and Accretion of Securities and Unearned Income, net	18.9	12.5
Provision for Credit Losses	(1.0)	2.0
Depreciation on Buildings and Equipment	23.3	22.4
Pension Plan Contributions	(11.5)	(9.1)
Change in Receivables	(5.6)	(95.4)
Change in Interest Payable	5.9	2.3
Change in Collateral With Derivative Counterparties, net	572.5	(200.1)
Other Operating Activities, net	(172.2)	(343.1)
Net Cash Provided by (Used in) Operating Activities	784.7	(295.5)
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	52.7	(143.9)
Change in Interest-Bearing Deposits with Banks	(327.8)	721.9
Net Change in Federal Reserve and Other Central Bank Deposits	767.1	1,987.3
Purchases of Securities — Held to Maturity	(2,284.1)	(1,287.7)
Proceeds from Maturity and Redemption of Securities — Held to Maturity	2,450.9	726.3
Purchases of Securities — Available for Sale	(2,633.6)	(3,285.2)
Proceeds from Sale, Maturity and Redemption of Securities — Available for Sale	3,235.9	2,416.6
Change in Loans and Leases	153.0	(950.6)
Purchases of Buildings and Equipment	(14.3)	(12.0)
Purchases and Development of Computer Software	(79.9)	(65.0)
Change in Client Security Settlement Receivables	(519.8)	261.0
Other Investing Activities, net	226.4	293.8
Net Cash Provided by Investing Activities	1,026.5	662.5
Cash Flows from Financing Activities:
Change in Deposits	(1,671.8)	388.6
Change in Federal Funds Purchased	164.7	(88.2)
Change in Securities Sold under Agreements to Repurchase	(40.4)	(39.5)
Change in Short-Term Other Borrowings	(1,030.6)	(27.1)
Repayments of Senior Notes and Long-Term Debt	(3.8)	(1.4)
Treasury Stock Purchased	(70.1)	(140.3)
Net Proceeds from Stock Options	37.2	5.3
Cash Dividends Paid on Common Stock	(86.9)	(82.8)
Cash Dividends Paid on Preferred Stock	(5.9)	(5.9)
Other Financing Activities, net	0.0	(8.9)
Net Cash Used in Financing Activities	(2,707.6)	(0.2)
Effect of Foreign Currency Exchange Rates on Cash	213.6	203.1
(Decrease) Increase in Cash and Due from Banks	(682.8)	569.9
Cash and Due from Banks at Beginning of Year	5,332.0	6,418.5
Cash and Due from Banks at End of Period	4,649.2	6,988.4
Supplemental Disclosures of Cash Flow Information:
Interest Paid	50.8	41.8
Income Taxes Paid	43.5	215.0
Transfers from Loans to OREO	2.3	4.6
Computer Software
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	75.6	65.8
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	$ 2.4	$ 2.1