Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 1,336.0	$ 1,545.3	$ 1,209.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security Gains (Losses), net	1.1	0.3	0.4
Amortization and Accretion of Securities and Unearned Income, net	59.2	99.7	88.9
Provision for Credit Losses	12.0	(81.5)	125.0
Depreciation and Amortization	553.6	515.6	500.3
Change in Accrued Income Taxes	61.3	37.2	25.4
Pension Plan Contributions	(24.3)	(11.2)	(15.6)
Deferred Income Tax Provision	(142.7)	2.0	16.4
Change in Receivables	57.9	(460.9)	4.5
Change in Interest Payable	172.6	(7.8)	(23.6)
Change in Collateral With Derivative Counterparties, net	639.4	(466.5)	(17.8)
Other Operating Activities, net	(333.7)	183.8	(16.4)
Net Cash (Used in) Provided by Operating Activities	2,392.4	1,356.0	1,896.8
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Federal Funds Sold	(32.0)	0.0	5.0
Change in Securities Purchased under Agreements to Resell	(419.0)	897.7	(700.9)
Change in Interest-Bearing Deposits with Banks	(158.9)	2,344.5	712.6
Net Change in Federal Reserve and Other Central Bank Deposits	23,483.8	(9,970.4)	(19,845.2)
Purchases of Held to Maturity Debt Securities	(32,830.8)	(54,734.9)	(40,187.9)
Proceeds from Maturity and Redemption of Held to Maturity Debt Securities	37,667.8	54,902.6	35,658.6
Purchases of Available for Sale Debt Securities	(4,567.7)	(13,896.2)	(10,886.8)
Proceeds from Maturity and Redemption of Available for Sale Debt Securities	6,513.0	10,079.0	8,748.2
Change in Loans and Leases	(2,441.6)	(6,744.7)	(2,316.7)
Purchases of Buildings and Equipment	(128.6)	(95.5)	(135.8)
Purchases and Development of Computer Software	(594.9)	(419.6)	(424.6)
Change in Client Security Settlement Receivables	258.0	(801.4)	(226.8)
Bank-Owned Life Insurance Policy Premiums	(500.0)	0.0	0.0
Other Investing Activities, net	(319.3)	(163.7)	(322.7)
Net Cash Used in Investing Activities	25,929.8	(18,602.6)	(29,923.0)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(32,996.9)	17,885.5	32,137.9
Change in Federal Funds Purchased	1,896.7	(260.0)	(292.7)
Change in Securities Sold under Agreements to Repurchase	35.3	492.1	(450.0)
Change in Short-Term Other Borrowings	3,966.9	(426.5)	(2,698.3)
Redemption of Preferred Stock - Series C	0.0	0.0	(400.0)
Proceeds from Senior Notes and Long-Term Debt	1,988.8	0.0	993.2
Repayments of Senior Notes	(500.0)	(500.0)	(508.6)
Repayment of Floating Rate Capital Debt	0.0	(278.8)	0.0
Treasury Stock Purchased	(35.4)	(267.6)	(299.8)
Net Proceeds from Stock Options	3.9	53.8	19.5
Cash Dividends Paid on Common Stock	(750.2)	(583.3)	(584.6)
Cash Dividends Paid on Preferred Stock	(46.5)	(41.8)	(45.9)
Other Financing Activities, net	0.0	0.1	1.2
Net Cash (Used in) Provided by Financing Activities	(26,437.4)	16,073.5	27,871.9
Effect of Foreign Currency Exchange Rates on Cash	(287.4)	(159.6)	84.6
Change in Cash and Due from Banks	1,597.4	(1,332.7)	(69.7)
Cash and Due from Banks at Beginning of Period	3,056.8	4,389.5	4,459.2
Cash and Due from Banks at End of Period	4,654.2	3,056.8	4,389.5
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	822.4	30.8	226.8
Income Taxes Paid	459.9	371.0	327.7
Transfers from Loans to OREO	0.0	12.9	0.2
Transfers from Available for Sale Debt Securities to Held to Maturity Debt Securities	$ 6,623.3	$ 6,864.1	$ 301.5