Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest income
Interest and fees on loans	$ 9,528	$ 8,187	$ 2,953
Interest on investment securities	1,347	648	354
Interest on deposits at banks	1,478	1,556	106
Total interest income	12,353	10,391	3,413
Interest expense
Deposits	3,864	2,497	335
Borrowings	1,346	1,182	132
Total interest expense	5,210	3,679	467
Net interest income	7,143	6,712	2,946
Provision for credit losses	431	1,375	645
All other noninterest expense	6,712	5,337	2,301
Noninterest income
Rental income on operating lease equipment	1,048	971	864
Realized gain (loss) on sale of investment securities, net	6	(26)	0
Fair value adjustment on marketable equity securities, net	13	(11)	(3)
Gain on sale of leasing equipment, net	30	20	15
Gain on acquisition	0	9,808	431
(Loss) gain on extinguishment of debt	(2)	0	7
Other noninterest income	148	136	139
Total noninterest income	2,615	12,075	2,136
Noninterest expense
Depreciation on operating lease equipment	394	371	345
Maintenance and other operating lease expenses	219	222	189
Personnel cost	3,078	2,636	1,408
Net occupancy expense	242	244	191
Equipment expense	504	422	216
Professional fees	121	71	45
Third-party processing fees	230	205	103
FDIC insurance expense	138	158	31
Marketing expense	76	102	53
Acquisition-related expenses	210	470	231
Intangible asset amortization	63	57	23
Other noninterest expense	460	377	240
Total noninterest expense	5,735	5,335	3,075
Income before income taxes	3,592	12,077	1,362
Income tax expense	815	611	264
Net income	2,777	11,466	1,098
Preferred stock dividends	61	59	50
Net income available to common stockholders, basic	2,716	11,407	1,048
Net income available to common shareholders, diluted	$ 2,716	$ 11,407	$ 1,048
Earnings per common share
Basic (in dollars per share)	$ 189.42	$ 785.14	$ 67.47
Diluted (in dollars per share)	$ 189.41	$ 784.51	$ 67.40
Weighted average common shares outstanding
Basic (in shares)	14,341,872	14,527,902	15,531,924
Diluted (in shares)	14,342,655	14,539,613	15,549,944
Lending-related fees
Noninterest income
Noninterest income	$ 257	$ 218	$ 103
Deposit fees and service charges
Noninterest income
Noninterest income	230	200	142
Client investment fees
Noninterest income
Noninterest income	213	157	0
Wealth management services
Noninterest income
Noninterest income	211	188	142
International fees
Noninterest income
Noninterest income	119	91	8
Factoring commissions
Noninterest income
Noninterest income	75	82	104
Cardholder services, net
Noninterest income
Noninterest income	163	139	102
Merchant services, net
Noninterest income
Noninterest income	49	48	35
Insurance commissions
Noninterest income
Noninterest income	$ 55	$ 54	$ 47