Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities
Net Income	$ 736.5	$ 772.0
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security Losses, net	0.5	0.2
Amortization and Accretion of Securities and Unearned Income, net	37.6	58.8
Provision for Credit Losses	(6.5)	(1.5)
Depreciation on Buildings and Equipment	49.7	55.2
Amortization of Computer Software	168.3	169.1
Amortization of Intangibles	8.3	8.9
Pension Plan Contributions	(3.0)	(71.9)
Change in Receivables	(470.3)	(207.5)
Change in Interest Payable	(5.3)	12.7
Change in Collateral With Derivative Counterparties, net	357.3	(941.4)
Other Operating Activities, net	(494.6)	(0.1)
Net Cash Provided by (Used in) Operating Activities	378.5	(145.5)
Cash Flows From Investing Activities
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	509.4	(113.7)
Change in Interest-Bearing Deposits with Banks	76.7	1,303.6
Net Change in Federal Reserve and Other Central Bank Deposits	2,492.8	6,794.9
Purchases of Debt Securities – Held to Maturity	(6,321.1)	(10,641.4)
Proceeds from Maturity and Redemption of Debt Securities – Held to Maturity	10,272.9	9,244.6
Purchases of Debt Securities – Available for Sale	(4,361.7)	(5,728.8)
Proceeds from Sale, Maturity and Redemption of Debt Securities – Available for Sale	3,772.5	4,036.3
Change in Loans and Leases	1,513.3	101.6
Purchases of Buildings and Equipment	(27.7)	(23.3)
Purchases and Development of Computer Software	(208.8)	(174.2)
Change in Client Security Settlement Receivables	331.2	(426.5)
Acquisition of a Business, Net of Cash Received	0.0	(70.0)
Bank Owned Life Insurance Premium Purchases	(1,000.0)	0.0
Other Investing Activities, net	281.8	(685.6)
Net Cash Provided by Investing Activities	7,331.3	3,617.5
Cash Flows From Financing Activities
Change in Deposits	(4,303.7)	(4,998.5)
Change in Federal Funds Purchased	(2,226.1)	935.9
Change in Securities Sold under Agreements to Repurchase	(43.8)	147.8
Change in Short-Term Other Borrowings	(145.2)	1,603.1
Proceeds from Senior Notes	(498.0)	0.0
Treasury Stock Purchased	(528.6)	(453.8)
Net Proceeds from Stock Options	9.1	21.9
Cash Dividends Paid on Common Stock	(251.9)	(189.6)
Cash Dividends Paid on Preferred Stock	(23.2)	(23.2)
Net Cash Used in Financing Activities	(7,015.4)	(2,956.4)
Effect of Foreign Currency Exchange Rates on Cash	72.3	(145.6)
Change in Cash and Due from Banks	766.7	370.0
Cash and Due from Banks at Beginning of Year	4,581.6	4,518.1
Cash and Due from Banks at End of Year	5,348.3	4,888.1
Supplemental Disclosures Of Cash Flow Information
Interest Paid	469.2	263.4
Income Taxes Paid	233.0	200.7
Transfers from Loans to OREO	$ 2.5	$ 2.5