CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net income	$ 825	$ 393	$ 548
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	(50)	(17)	112
Gain on sale of branch disposal group, net	0	0	(113)
Provision for credit losses	50	45	154
Deferred income tax provision	126	51	284
Net realized losses (gains) on securities available-for-sale	124	243	(26)
Net change in other assets and liabilities	(10)	1,359	(1,044)
Net change in loans held for sale:
Originations and purchases of loans held for sale	(831)	(340)	(1,932)
Sales and collections of loans held for sale	643	320	1,791
Net change in trading assets and liabilities	1,257	297	2,093
Lower of amortized cost or fair value adjustments on loans held for sale	(2)	32	19
Loss on instruments designated at fair value and related derivatives	38	42	50
Net cash provided by operating activities	2,170	2,425	1,936
Cash flows from investing activities
Net change in federal funds sold and securities purchased under agreements to resell	(435)	9,207	(12,571)
Securities available-for-sale:
Purchases of securities available-for-sale	(9,483)	(4,467)	(4,997)
Proceeds from sales of securities available-for-sale	6,453	1,642	1,812
Proceeds from paydowns and maturities of securities available-for-sale	3,674	4,988	5,992
Securities held-to-maturity:
Purchases of securities held-to-maturity	(4,124)	(8,592)	(3,585)
Proceeds from paydowns and maturities of securities held-to-maturity	1,452	880	1,460
Change in loans:
Originations, net of collections	(6,406)	(1,368)	(3,205)
Loans sold to third parties	2,847	1,806	1,476
Net cash used for acquisitions of properties and equipment	(16)	(29)	(42)
Cash received on transfer of certain precious metals trading and financing activities to an affiliate	0	10	0
Net outflow related to the sale of branch disposal group	0	0	(4,619)
Other, net	(128)	(140)	(17)
Net cash provided by (used in) investing activities	(6,166)	3,937	(18,296)
Cash flows from financing activities
Net change in deposits	2,033	(1,941)	(12,534)
Debt:
Net change in short-term borrowings	(2,562)	3,969	(393)
Issuance of long-term debt	9,254	4,553	5,931
Repayment of long-term debt	(7,073)	(4,448)	(3,229)
Preferred stock redemption	0	0	(1,000)
Return of capital to parent	0	0	(2,000)
Other decreases in capital surplus	(13)	(8)	(2)
Dividends paid	(116)	(1,516)	(77)
Net cash provided by (used in) financing activities	1,523	609	(13,304)
Net change in cash and due from banks and interest bearing deposits with banks	(2,473)	6,971	(29,664)
Cash and due from banks and interest bearing deposits with banks at beginning of period	25,719	18,748	48,412
Cash and due from banks and interest bearing deposits with banks at end of period	23,246	25,719	18,748
Supplemental disclosure of cash flow information
Interest paid during the period	5,932	5,123	1,660
Net income taxes paid (refunded) during the period	35	(108)	(122)
Noncash Investing and Financing Items [Abstract]
Transfer of loans to (from) held for sale, net	$ 2,729	$ 1,820
Transfer of loans to (from) held for sale, net			$ (29)