Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 334.6	$ 389.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security Gains	(6.9)	0.0
Amortization and Accretion of Securities and Unearned Income, net	7.0	21.7
Provision for Credit Losses	15.0	2.0
Depreciation and Amortization	154.9	130.9
Pension Plan Contributions	(16.5)	(20.7)
Change in Receivables	(193.1)	285.4
Change in Interest Payable	59.8	12.0
Change in Collateral With Derivative Counterparties, net	(717.8)	(505.7)
Other Operating Activities, net	198.1	432.0
Net Cash (Used in) Provided by Operating Activities	(164.9)	746.9
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Securities Purchased under Agreements to Resell	36.4	(336.2)
Change in Interest-Bearing Deposits with Banks	360.0	(843.9)
Net Change in Federal Reserve and Other Central Bank Deposits	1,021.6	8,497.2
Purchases of Held to Maturity Debt Securities	(9,867.8)	(11,916.4)
Proceeds from the Maturity and Redemption of Held to Maturity Debt Securities	10,412.9	13,983.4
Purchases of Available for Sale Debt Securities	(1,273.9)	(1,784.8)
Proceeds from the Maturity and Sales of Available for Sale Debt Securities	3,626.5	1,821.5
Change in Loans	528.9	1,233.1
Purchases of Buildings and Equipment	(11.5)	(25.8)
Purchases and Development of Computer Software	(117.6)	(123.2)
Change in Client Security Settlement Receivables	400.2	(250.3)
Other Investing Activities, net	(196.5)	71.0
Net Cash Provided by Investing Activities	4,919.2	10,325.6
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(10,478.1)	(9,862.9)
Change in Federal Funds Purchased	2,590.4	0.0
Change in Securities Sold under Agreements to Repurchase	(204.3)	(202.2)
Change in Short-Term Other Borrowings	3,766.3	(70.4)
Treasury Stock Purchased	(100.9)	(33.8)
Net Proceeds from Stock Options	1.6	2.6
Cash Dividends Paid on Common Stock	(156.5)	(145.5)
Cash Dividends Paid on Preferred Stock	(16.2)	(4.7)
Other Financing Activities, net	0.0	0.3
Net Cash Used in Financing Activities	(4,597.7)	(10,316.6)
Effect of Foreign Currency Exchange Rates on Cash	15.1	(29.5)
Change in Cash and Due from Banks	171.7	726.4
Cash and Due from Banks at Beginning of Period	4,654.2	3,056.8
Cash and Due from Banks at End of Period	4,825.9	3,783.2
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	864.1	(9.7)
Income Taxes Paid	$ 31.2	$ 47.2