Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities
Net income		$ 2,229	$ 1,960	$ 1,971
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		463	420	402
Depreciation, amortization, and accretion		762	622	798
Share-based compensation expense		113	106	97
Deferred income tax benefit		(403)	(26)	(302)
Net losses (gains) on sales of securities		58	0	0
Gain from early extinguishment of debt		(11)	(8)	0
Net change in:
Trading account securities		(10)	72	(106)
Loans held for sale		(170)	(227)	(83)
Other assets		(825)	(761)	(491)
Short-term borrowings		117	21	0
Other liabilities		230	(344)	341
Other, net		71	(1)	(30)
Net cash provided by operating activities		2,482	1,836	2,657
Investing activities
Change in interest-earning deposits with banks		297	(254)	23
Proceeds from:
Maturities and calls of available-for-sale securities		7,137	11,001	2,689
Maturities and calls of held-to-maturity securities		1,642	1,397	1,523
Maturities and calls of other securities		109	57	615
Sales of available-for-sale securities		1,691	990	767
Sales of other securities		0	0	144
Purchases of available-for-sale securities		(5,325)	(14,043)	(4,965)
Purchases of held-to-maturity securities		(515)	(2,037)	(256)
Purchases of other securities		(211)	(155)	(630)
Net proceeds from sales of loans and leases		457	391	450
Principal payments received under direct finance leases		1,856	1,769	1,891
Net loan and lease activity, excluding sales and purchases		(12,850)	(10,025)	(5,108)
Purchases of premises and equipment		(267)	(143)	(140)
Purchases of loans and leases		(981)	(680)	(71)
Net accrued income and other receivables activity		(332)	(474)	(17)
Net cash and cash equivalents received from business combinations		864	0	0
Other, net		81	87	88
Net cash used in investing activities		(6,347)	(12,119)	(2,997)
Financing activities
Increase in deposits		3,646	11,218	3,316
Increase (decrease) in short-term borrowings		785	(803)	(1,295)
Net proceeds from issuance of long-term debt		2,500	7,661	14,965
Repayment of long-term debt		(2,053)	(3,563)	(12,376)
Dividends paid on preferred stock		(108)	(143)	(134)
Dividends paid on common stock		(908)	(903)	(900)
Repurchase/redemption of preferred stock		0	(410)	(82)
Net proceeds from issuance of preferred stock		741	0	317
Other, net		(90)	(56)	(46)
Net cash provided by financing activities		4,513	13,001	3,765
Increase in cash and cash equivalents		648	2,718	3,425
Cash and cash equivalents at beginning of period	[1]	12,847	10,129	6,704
Cash and cash equivalents at end of period	[1]	13,495	12,847	10,129
Supplemental disclosures:
Interest paid		4,267	4,547	3,359
Income taxes paid		274	123	90
Non-cash activities:
Loans transferred to held-for-sale from portfolio		988	390	439
Loans transferred to portfolio from held-for-sale		23	34	22
Veritex Holdings, Inc.
Business combination:
Fair value of tangible assets acquired		11,057	0	0
Goodwill and other intangible assets		555	0	0
Fair value of liabilities assumed		10,792	0	0
Common stock and equity-based awards issued		$ 1,682	$ 0	$ 0

[1] Includes cash and due from banks and interest-earning deposits at the FRB, included within Interest-earning deposits with banks on our Consolidated Balance Sheets.