Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities:
Net income	$ 2,945	$ 2,687	$ 1,944
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax (benefit)	(89)	145	(184)
Amortization of other intangible assets	223	230	239
Other non-cash adjustments for depreciation, amortization and accretion, net	331	375	643
(Gains) losses related to investment securities, net	(4)	79	294
Provision for credit losses	59	75	46
Change in trading account assets, net	(59)	5	(123)
Change in accrued interest and fees receivable, net	(350)	(224)	(359)
Change in collateral deposits, net	6,611	(12,109)	(2,246)
Change in unrealized losses (gains) on foreign exchange derivatives, net	5,512	(7,191)	2,146
Change in other assets, net	(2,524)	1,672	(1,839)
Change in accrued expenses and other liabilities, net	(1,167)	743	(128)
Other, net	410	303	257
Net cash provided by (used in) operating activities	11,898	(13,210)	690
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	(12,998)	(25,292)	13,928
Net (increase) decrease in securities purchased under resale agreements	(133)	13	(1,477)
Proceeds from sales of available-for-sale securities	15,999	10,973	4,917
Proceeds from maturities of available-for-sale securities	29,040	18,517	15,703
Purchases of available-for-sale securities	(50,245)	(44,301)	(23,089)
Proceeds from maturities of held-to-maturity securities	9,858	9,330	9,474
Purchases of held-to-maturity securities	0	(5)	(1,582)
Sale of loans	1,068	246	506
Net increase in loans	(3,719)	(7,369)	(4,746)
Business acquisitions, net of cash acquired	(286)	(194)	(61)
Purchases of equity investments and other long-term assets	(1,164)	(143)	(136)
Purchases of premises and equipment, net	(1,055)	(926)	(816)
Other, net	644	(332)	117
Net cash (used in) provided by investing activities	(12,991)	(39,483)	12,738
Financing Activities:
Net (decrease) increase in time deposits	(3,108)	(19)	2,820
Net increase (decrease) in all other deposits	14,471	40,971	(17,311)
Net (decrease) increase in securities sold under repurchase agreements	(2,840)	1,814	690
Net (decrease) increase in other short-term borrowings	(6,018)	6,180	1,563
Proceeds from issuance of long-term debt, net of issuance costs	5,722	6,523	6,221
Payments for long-term debt and obligations under finance leases	(4,143)	(2,046)	(2,545)
Payments for redemption of preferred stock	0	(1,500)	0
Proceeds from issuance of preferred stock, net of issuance costs	743	2,323	0
Repurchases of common stock	(1,200)	(1,319)	(3,781)
Repurchases of common stock for employee tax withholding	(106)	(83)	(95)
Payments for cash dividends	(1,120)	(1,033)	(970)
Other, net	(20)	(20)	57
Net cash provided by (used in) financing activities	2,381	51,791	(13,351)
Net increase (decrease)	1,288	(902)	77
Cash and due from banks at beginning of period	3,145	4,047	3,970
Cash and due from banks at end of period	4,433	3,145	4,047
Supplemental disclosure:
Interest paid	8,805	8,951	6,184
Income taxes paid, net	$ 594	$ 451	$ 423