CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Fee revenue:
Servicing fees	$ 1,409	$ 1,275
Management fees	724	587
Foreign exchange trading services	435	337
Securities finance	116	114
Software services	169	158
Other fee revenue	107	99
Total fee revenue	2,960	2,570
Net interest income:
Interest income	2,651	2,922
Interest expense	1,816	2,208
Net interest income	835	714
Other income:
Gains from sales of available-for-sale securities, net	1	0
Total other income	1	0
Total revenue	3,796	3,284
Provision for credit losses	16	12
Expenses:
Compensation and employee benefits	1,441	1,262
Information systems and communications	637	497
Transaction processing services	283	258
Occupancy	101	103
Other	349	330
Total expenses	2,811	2,450
Income before income tax expense	969	822
Income tax expense	205	178
Net income	764	644
Net income available to common shareholders, basic	705	597
Net income available to common shareholders, diluted	$ 705	$ 597
Earnings per common share:
Basic (in USD per share)	$ 2.53	$ 2.07
Diluted (in USD per share)	$ 2.49	$ 2.04
Average common shares outstanding (in thousands):
Basic (in shares)	278,434	288,562
Diluted (in shares)	282,874	292,716
Cash dividends declared (in USD per share)	$ 0.84	$ 0.76

CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Operating Activities:
Net income	$ 764	$ 644
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax	28	18
Amortization of other intangible assets	57	54	$ 223
Other non-cash adjustments for depreciation, amortization and accretion, net	160	34
Gains related to investment securities, net	(1)	0
Provision for credit losses	16	12
Change in trading account assets, net	(15)	25
Change in accrued interest and fees receivable, net	(313)	(247)
Change in collateral deposits, net	(5,682)	(1,697)
Change in unrealized losses on foreign exchange derivatives, net	(4,369)	4,613
Change in other assets, net	(4,650)	(1,761)
Change in accrued expenses and other liabilities, net	1,625	545
Other, net	237	156
Net cash (used in) provided by operating activities	(12,143)	2,396
Investing Activities:
Net increase (decrease) in interest-bearing deposits with banks	3,356	(6,507)
Net increase in securities purchased under resale agreements	(1,375)	(1,291)
Proceeds from sales of available-for-sale securities	3,944	2,047
Proceeds from maturities of available-for-sale securities	5,301	8,832
Purchases of available-for-sale securities	(13,936)	(18,449)
Proceeds from maturities of held-to-maturity securities	1,420	2,333
Sale of loans	132	85
Net increase in loans	(2,858)	(1,281)
Purchases of equity investments and other long-term assets	(156)	(47)
Purchases of premises and equipment, net	(270)	(226)
Other, net	59	(103)
Net cash used in investing activities	(4,383)	(14,607)
Financing Activities:
Net (decrease) increase in time deposits	(1,097)	2,663
Net increase in all other deposits	20,086	7,469
Net increase (decrease) in securities sold under repurchase agreements	128	(157)
Net increase in other short-term borrowings	159	2,010
Proceeds from issuance of long-term debt, net of issuance costs	123	2,737
Payments for long-term debt and obligations under finance leases	(5)	(1,312)
Proceeds from issuance of preferred stock, net of issuance costs	0	743
Repurchases of common stock	(400)	(100)
Repurchases of common stock for employee tax withholding	(85)	(57)
Payments for cash dividends	(293)	(266)
Other, net	(5)	(6)
Net cash provided by financing activities	18,611	13,724
Net increase in cash and due from banks	2,085	1,513
Cash and due from banks at beginning of period	4,433	3,145	3,145
Cash and due from banks at end of period	6,518	4,658	$ 4,433
Supplemental disclosure:
Interest paid	1,784	2,074
Income taxes paid, net	$ 92	$ 186

Commitments and Guarantees - Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Unfunded credit facilities	$ 35,590	$ 35,697
Indemnified securities financing	407,558	371,968
Standby letters of credit	$ 461	$ 569