Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income
Interest and fees on loans	$ 2,354	$ 1,017
Interest on investment securities	282	107
Interest on deposits at banks	448	87
Total interest income	3,084	1,211
Interest expense
Deposits	928	288
Borrowings	339	73
Total interest expense	1,267	361
Net interest income	1,817	850
Provision for credit losses	64	783
Net interest income after provision for credit losses	1,753	67
Noninterest income
Rental income on operating lease equipment	255	233
Realized loss on sale of investment securities available for sale, net	0	(14)
Fair value adjustment on marketable equity securities, net	(4)	(9)
Gain on sale of leasing equipment, net	10	4
Gain on acquisition	0	9,824
Loss on extinguishment of debt	(2)	0
Other noninterest income	36	41
Total noninterest income	627	10,259
Noninterest expense
Depreciation on operating lease equipment	96	89
Maintenance and other operating lease expenses	45	56
Salaries and benefits	744	420
Net occupancy expense	62	50
Equipment expense	114	58
Professional fees	25	11
Third-party processing fees	60	30
FDIC insurance expense	41	18
Marketing expense	14	15
Acquisition-related expenses	58	28
Intangible asset amortization	17	5
Other noninterest expense	100	75
Total noninterest expense	1,376	855
Income before income taxes	1,004	9,471
Income tax expense (benefit)	273	(47)
Net income	731	9,518
Preferred stock dividends	15	14
Net income available to common stockholders, basic	716	9,504
Net income available to common shareholders, diluted	$ 716	$ 9,504
Earnings per common share
Basic (in dollars per share)	$ 49.27	$ 654.22
Diluted (in dollars per share)	$ 49.26	$ 653.64
Weighted average common shares outstanding
Basic (in shares)	14,533,302	14,526,693
Diluted (in shares)	14,536,442	14,539,709
Fee income and other service charges
Noninterest income
Noninterest income	$ 75	$ 47
Client investment fees
Noninterest income
Noninterest income	50	2
Wealth management services
Noninterest income
Noninterest income	51	40
International fees
Noninterest income
Noninterest income	28	4
Service charges on deposit accounts
Noninterest income
Noninterest income	44	24
Factoring commissions
Noninterest income
Noninterest income	17	19
Cardholder services, net
Noninterest income
Noninterest income	40	21
Merchant services, net
Noninterest income
Noninterest income	12	10
Insurance commissions
Noninterest income
Noninterest income	$ 15	$ 13