Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 785.5	$ 743.2
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security (Losses) Gains, net	0.0	0.0
Amortization and Accretion of Securities and Unearned Income, net	34.4	50.1
Provision for Credit Losses	6.5	(57.0)
Depreciation and Amortization	264.5	253.8
Pension Plan Contributions	(20.7)	(6.7)
Change in Receivables	192.2	(78.9)
Change in Interest Payable	25.7	(0.4)
Change in Collateral With Derivative Counterparties, net	(2,314.2)	(1,907.5)
Other Operating Activities, net	162.2	(164.3)
Net Cash Used in Operating Activities	(863.9)	(1,167.7)
CASH FLOWS FROM INVESTING ACTIVITIES
Change in Federal Funds Sold	(10.0)	(0.1)
Change in Securities Purchased under Agreements to Resell	(503.1)	639.7
Change in Interest-Bearing Deposits with Banks	(645.9)	534.5
Net Change in Federal Reserve and Other Central Bank Deposits	25,295.1	1,000.6
Purchases of Held to Maturity Debt Securities	(21,034.6)	(28,474.5)
Proceeds from Maturity and Redemption of Held to Maturity Debt Securities	23,282.6	30,847.7
Purchases of Available for Sale Debt Securities	(2,741.1)	(6,623.7)
Proceeds from Maturity and Redemption of Available for Sale Debt Securities	3,646.9	4,441.0
Change in Loans and Leases	(763.9)	(3,651.1)
Purchases of Buildings and Equipment	(47.2)	(39.1)
Purchases and Development of Computer Software	(270.0)	(169.3)
Change in Client Security Settlement Receivables	(372.5)	(857.7)
Bank-Owned Life Insurance Policy Premiums	(500.0)	0.0
Other Investing Activities, net	(110.5)	120.4
Net Cash Provided by (Used in) Investing Activities	25,225.8	(2,231.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	(23,291.2)	2,961.5
Change in Federal Funds Purchased	389.0	(260.0)
Change in Securities Sold under Agreements to Repurchase	267.5	489.3
Change in Short-Term Other Borrowings	(77.4)	1,141.7
Proceeds from Senior Notes	995.4	0.0
Treasury Stock Purchased	(34.1)	(165.8)
Net Proceeds from Stock Options	2.6	41.0
Cash Dividends Paid on Common Stock	(291.5)	(291.7)
Cash Dividends Paid on Preferred Stock	(20.9)	(20.9)
Other Financing Activities, net	0.2	0.0
Net Cash (Used in) Provided by Financing Activities	(22,060.4)	3,895.1
Effect of Foreign Currency Exchange Rates on Cash	(238.5)	(86.0)
Change in Cash and Due from Banks	2,063.0	409.8
Cash and Due from Banks at Beginning of Period	3,056.8	4,389.5
Cash and Due from Banks at End of Period	5,119.8	4,799.3
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	44.2	17.2
Income Taxes Paid	164.1	189.7
Transfers from Loans to OREO	0.1	3.4
Transfers from Available for Sale Debt Securities to Held to Maturity Debt Securities	$ 0.0	$ 6,864.1