Consolidated Statement of Cash Flows - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Operating Activities:
Net income	$ 549,000,000	$ 604,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax (benefit)	32,000,000	7,000,000
Amortization of other intangible assets	60,000,000	61,000,000	$ 238,000,000
Other non-cash adjustments for depreciation, amortization and accretion, net	171,000,000	232,000,000
Losses (gains) related to investment securities, net	0	1,000,000
Provision for credit losses	44,000,000	0
Change in trading account assets, net	(45,000,000)	4,000,000
Change in accrued interest and fees receivable, net	(136,000,000)	(168,000,000)
Change in collateral deposits, net	(2,962,000,000)	(187,000,000)
Change in unrealized losses (gains) on foreign exchange derivatives, net	(156,000,000)	(1,075,000,000)
Change in other assets, net	282,000,000	(955,000,000)
Change in accrued expenses and other liabilities, net	(796,000,000)	5,862,000,000
Other, net	95,000,000	200,000,000
Net cash provided by operating activities	(2,862,000,000)	4,586,000,000
Investing Activities:
Net decrease in interest-bearing deposits with banks	13,630,000,000	2,348,000,000
Net decrease in securities purchased under resale agreements	4,082,000,000	2,209,000,000
Proceeds from sales of available-for-sale securities	232,000,000	1,600,000,000
Proceeds from maturities of available-for-sale securities	3,436,000,000	4,494,000,000
Purchases of available-for-sale securities	(5,239,000,000)	(11,689,000,000)
Proceeds from maturities of held-to-maturity securities	1,363,000,000	3,632,000,000
Purchases of held-to-maturity securities	(1,557,000,000)	(4,119,000,000)
Sale of loans	273,000,000	38,000,000
Net (increase) in loans	(1,914,000,000)	(2,648,000,000)
Purchases of equity investments and other long-term assets	0	(71,000,000)
Purchases of premises and equipment, net	(182,000,000)	(138,000,000)
Other, net	188,000,000	8,000,000
Net cash provided by (used in) investing activities	14,312,000,000	(4,336,000,000)
Financing Activities:
Net increase (decrease) in time deposits	728,000,000	(1,298,000,000)
Net decrease in all other deposits	(12,560,000,000)	(2,696,000,000)
Net increase in securities sold under repurchase agreements	2,518,000,000	2,702,000,000
Net decrease in other short-term borrowings	(2,089,000,000)	(111,000,000)
Proceeds from issuance of long-term debt, net of issuance costs	1,244,000,000	1,492,000,000
Payments for long-term debt and obligations under finance leases	(11,000,000)	(765,000,000)
Repurchases of common stock	(1,250,000,000)	0
Repurchases of common stock for employee tax withholding	(59,000,000)	0
Payments for cash dividends	(243,000,000)	(229,000,000)
Net cash (used in) provided by financing activities	(11,722,000,000)	(905,000,000)
Net decrease in cash and due from banks	(272,000,000)	(655,000,000)
Cash and due from banks at beginning of period	3,970,000,000	3,631,000,000	3,631,000,000
Cash and due from banks at end of period	3,698,000,000	2,976,000,000	$ 3,970,000,000
Supplemental disclosure:
Interest paid (received)	1,212,000,000	(22,000,000)
Income taxes paid, net	$ 75,000,000	$ 121,000,000