Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 680	$ 907	$ 1,129
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	132	122	(276)
Depreciation and amortization	140	110	(14)
Share-based compensation	33	30	28
Deferred income tax expense (benefit)	(9)	(43)	32
Net decrease (increase) in trading securities	22	(93)	(107)
Net decrease (increase) in loans held for sale	(40)	48	14
Change in other liabilities	(299)	892	13
Change in other assets	169	(457)	(78)
Other, net	57	(46)	(112)
Net cash provided by operating activities	885	1,470	629
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	1,736	8,650	(5,577)
Proceeds from maturities and paydowns of investment securities held-to-maturity	1,052	445	457
Purchases of investment securities held-to-maturity	(41)	(399)	(262)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	2,337	3,309	4,748
Purchases of investment securities available-for-sale	(666)	(5,829)	(13,647)
Net change in loans and leases	(2,103)	(4,628)	2,814
Purchases and sales of other noninterest-bearing investments	183	(298)	63
Purchases of premises and equipment	(113)	(190)	(206)
Acquisition of Nevada branches, net of cash acquired	0	318	0
Other, net	(15)	27	31
Net cash provided by (used in) investing activities	2,370	1,405	(11,579)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	3,309	(11,567)	13,136
Net change in short-term funds borrowed	(6,038)	9,514	(669)
Cash paid for preferred stock redemption	0	0	(126)
Redemption of long-term debt	(128)	(290)	(286)
Proceeds from the issuance of common stock	3	9	21
Dividends paid on common and preferred stock	(282)	(269)	(261)
Bank common stock repurchased	(51)	(202)	(800)
Other, net	(9)	(8)	(13)
Net cash provided by (used in) financing activities	(3,196)	(2,813)	11,002
Net increase in cash and due from banks	59	62	52
Cash and due from banks at beginning of year	657	595	543
Cash and due from banks at end of year	716	657	595
Cash paid for interest	1,368	160	81
Net cash paid for income taxes	255	21	442
Noncash activities:
Loans held for investment transferred to other real estate owned	0	0	25
Loans held for investment reclassified to loans held for sale, net	68	114	120
Trading securities reclassified to money market investments	395	0	0
Investment securities available-for-sale transferred to held-to-maturity, at amortized cost (fair value $10,691)	0	13,097	0
Deposits acquired in purchase of Nevada branches	0	430	0
Loans acquired in purchase of Nevada branches, net	$ 0	$ 95	$ 0