Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities
Net Income	$ 1,121.1	$ 1,146.5
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security Losses, net	0.9	0.3
Amortization and Accretion of Securities and Unearned Income, net	51.7	79.8
Provision for Credit Losses	(13.5)	(10.5)
Depreciation on Buildings and Equipment	76.5	81.9
Amortization of Computer Software	252.6	251.8
Amortization of Intangibles	12.5	13.2
Pension Plan Contributions	(3.0)	(71.9)
Change in Receivables	(328.6)	(241.0)
Change in Interest Payable	(9.2)	26.1
Change in Collateral With Derivative Counterparties, net	39.8	(262.0)
Other Operating Activities, net	(245.2)	294.2
Net Cash Provided by Operating Activities	955.6	1,308.4
Cash Flows From Investing Activities
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	616.3	(211.9)
Change in Interest-Bearing Deposits with Banks	198.3	2,648.9
Net Change in Federal Reserve and Other Central Bank Deposits	7,032.2	7,234.1
Purchases of Debt Securities – Held to Maturity	(9,862.0)	(15,907.1)
Proceeds from Maturity and Redemption of Debt Securities – Held to Maturity	12,448.2	14,334.1
Purchases of Debt Securities – Available for Sale	(8,644.3)	(9,128.6)
Proceeds from Sale, Maturity and Redemption of Debt Securities – Available for Sale	6,910.0	6,160.7
Change in Loans and Leases	1,636.9	1,210.8
Purchases of Buildings and Equipment	(49.8)	(39.0)
Purchases and Development of Computer Software	(304.7)	(289.1)
Change in Client Security Settlement Receivables	(465.1)	56.5
Acquisition of a Business, Net of Cash Received	(10.5)	(70.0)
Bank Owned Life Insurance Premium Purchases	(1,000.0)	0.0
Other Investing Activities, net	492.9	(651.2)
Net Cash Provided by Investing Activities	8,998.4	5,348.2
Cash Flows From Financing Activities
Change in Deposits	(6,355.5)	(6,296.5)
Change in Federal Funds Purchased	(2,393.7)	277.9
Change in Securities Sold under Agreements to Repurchase	96.9	(786.6)
Change in Short-Term Other Borrowings	(118.7)	1,689.1
Proceeds from Senior Notes	(498.0)	(497.9)
Repayments of Senior Notes and Long-Term Debt	0.0	(305.4)
Treasury Stock Purchased	(835.8)	(689.7)
Net Proceeds from Stock Options	19.9	29.9
Cash Dividends Paid on Common Stock	(381.0)	(283.6)
Cash Dividends Paid on Preferred Stock	(29.1)	(29.1)
Other Financing Activities, net	0.1	0.1
Net Cash Used in Financing Activities	(9,498.9)	(5,896.0)
Effect of Foreign Currency Exchange Rates on Cash	0.9	(205.3)
Change in Cash and Due from Banks	456.0	555.3
Cash and Due from Banks at Beginning of Year	4,581.6	4,518.1
Cash and Due from Banks at End of Year	5,037.6	5,073.4
Supplemental Disclosures Of Cash Flow Information
Interest Paid	675.9	441.4
Income Taxes Paid	360.3	352.2
Transfers from Loans to OREO	$ 2.6	$ 11.3