Consolidated Statements of Cash Flows (Unaudited - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 772.0	$ 544.0
Adjustments to Reconcile Net Income to Net Cash (Used in) Provided by Operating Activities:
Investment Security Losses, net	0.2	0.7
Amortization and Accretion of Securities and Unearned Income, net	58.8	53.0
Provision for Credit Losses	(1.5)	(8.0)
Depreciation on Buildings and Equipment	55.2	47.0
Pension Plan Contributions	(71.9)	(11.5)
Change in Receivables	(207.5)	(71.4)
Change in Interest Payable	12.7	8.3
Change in Collateral With Derivative Counterparties, net	(941.4)	477.0
Other Operating Activities, net	(0.1)	(885.9)
Net Cash (Used in) Provided by Operating Activities	(145.5)	312.6
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	(113.7)	(106.3)
Change in Interest-Bearing Deposits with Banks	1,303.6	116.1
Net Change in Federal Reserve and Other Central Bank Deposits	6,794.9	(1,804.9)
Purchases of Debt Securities — Held to Maturity	(10,641.4)	(4,724.2)
Proceeds from Maturity and Redemption of Debt Securities — Held to Maturity	9,244.6	4,857.7
Purchases of Debt Securities — Available for Sale	(5,728.8)	(4,388.5)
Proceeds from Sale, Maturity and Redemption of Debt Securities — Available for Sale	4,036.3	5,819.9
Change in Loans and Leases	101.6	531.8
Purchases of Buildings and Equipment	(23.3)	(40.1)
Purchases and Development of Computer Software	(174.2)	(179.3)
Change in Client Security Settlement Receivables	(426.5)	(662.7)
Acquisition of a Business, Net of Cash Received	(70.0)	0.0
Other Investing Activities, net	(685.6)	282.5
Net Cash Provided by (Used in) Investing Activities	3,617.5	(298.0)
Cash Flows from Financing Activities:
Change in Deposits	(4,998.5)	1,313.8
Change in Federal Funds Purchased	935.9	(46.1)
Change in Securities Sold under Agreements to Repurchase	147.8	(10.0)
Change in Short-Term Other Borrowings	1,603.1	(1,060.2)
Proceeds from Senior Notes and Long-Term Debt	0.0	350.0
Repayments of Senior Notes and Long-Term Debt	0.0	(5.3)
Treasury Stock Purchased	(453.8)	(227.7)
Net Proceeds from Stock Options	21.9	70.3
Cash Dividends Paid on Common Stock	(189.6)	(174.2)
Cash Dividends Paid on Preferred Stock	(23.2)	(26.6)
Other Financing Activities, net	0.0	0.1
Net Cash (Used in) Provided by Financing Activities	(2,956.4)	184.1
Effect of Foreign Currency Exchange Rates on Cash	(145.6)	164.1
Change in Cash and Due from Banks	370.0	362.8
Cash and Due from Banks at Beginning of Year	4,518.1	5,332.0
Cash and Due from Banks at End of Period	4,888.1	5,694.8
Supplemental Disclosures of Cash Flow Information:
Interest Paid	263.4	124.0
Income Taxes Paid	200.7	312.2
Transfers from Loans to OREO	2.5	5.8
Computer Software
Adjustments to Reconcile Net Income to Net Cash (Used in) Provided by Operating Activities:
Amortization of Intangibles	169.1	154.7
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash (Used in) Provided by Operating Activities:
Amortization of Intangibles	$ 8.9	$ 4.7