CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 525.5	$ 392.0
Adjustments to Reconcile Net Income to Net Cash (Used in) Provided by Operating Activities
Investment Security Gains (Losses), net	0.0	0.0
Amortization and Accretion of Securities and Unearned Income, net	(19.7)	(13.9)
Provision for Credit Losses	(3.0)	1.0
Depreciation and Amortization	197.1	190.7
Pension Plan Contributions	(7.2)	(137.9)
Change in Receivables	(164.8)	(206.0)
Change in Interest Payable	28.6	44.0
Change in Collateral With Derivative Counterparties, net	(1,172.5)	2,335.0
Other Operating Activities, net	296.0	144.9
Net Cash (Used in) Provided by Operating Activities	(320.0)	2,749.8
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	999.7	327.9
Change in Interest-Bearing Deposits with Banks	(149.6)	305.3
Net Change in Federal Reserve and Other Central Bank Deposits	11,283.6	(13,621.9)
Purchases of Held to Maturity Debt Securities	(9,594.2)	(6,126.8)
Proceeds from the Maturity and Redemption of Held to Maturity Debt Securities	8,531.7	7,927.8
Purchases of Available for Sale Debt Securities	(4,644.5)	(2,495.6)
Proceeds from the Maturity and Sales of Available for Sale Debt Securities	1,727.2	1,241.3
Change in Loans	(580.5)	2,576.3
Purchases of Buildings and Equipment	(9.4)	(12.4)
Purchases and Development of Computer Software	(210.1)	(171.1)
Other Investing Activities, net	(3,867.8)	(236.2)
Net Cash (Used in) Provided by Investing Activities	3,486.1	(10,285.4)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(2,534.5)	7,171.9
Change in Federal Funds Purchased	(166.7)	218.1
Change in Securities Sold under Agreements to Repurchase	38.3	(126.4)
Change in Short-Term Other Borrowings	662.6	8.2
Repayments of Long-Term Debt	(600.0)	0.0
Treasury Stock Purchased	(358.9)	(287.2)
Net Proceeds from Stock Options	2.7	4.5
Cash Dividends Paid on Common Stock	(148.5)	(146.1)
Cash Dividends Paid on Preferred Stock	(16.2)	(16.2)
Other Financing Activities, net	(1.7)	(2.5)
Net Cash (Used in) Provided by Financing Activities	(3,122.9)	6,824.3
Effect of Foreign Currency Exchange Rates on Cash	(100.3)	402.8
Change in Cash and Due from Banks	(57.1)	(308.5)
Cash and Due from Banks at Beginning of Period	5,873.1	4,677.2
Cash and Due from Banks at End of Period	5,816.0	4,368.7
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	1,551.2	1,524.4
Income Taxes Paid	$ 97.9	$ 52.3