Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 907	$ 1,129	$ 539
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	122	(276)	414
Depreciation and amortization	110	(14)	86
Share-based compensation	30	28	26
Deferred income tax expense (benefit)	(43)	32	(58)
Net increase in trading securities	(93)	(107)	(83)
Net decrease (increase) in loans held for sale	48	14	(10)
Change in other liabilities	892	13	57
Change in other assets	(457)	(78)	(223)
Other, net	(46)	(112)	(29)
Net cash provided by operating activities	1,470	629	719
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	8,650	(5,577)	(5,611)
Proceeds from maturities and paydowns of investment securities held-to-maturity	445	457	386
Purchases of investment securities held-to-maturity	(399)	(262)	(430)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	3,309	4,748	4,339
Purchases of investment securities available-for-sale	(5,829)	(13,647)	(6,151)
Net change in loans and leases	(4,628)	2,814	(4,687)
Purchases and sales of other noninterest-bearing investments	(298)	63	79
Purchases of premises and equipment	(190)	(206)	(171)
Acquisition of Nevada branches, net of cash acquired	318	0	0
Other, net	27	31	42
Net cash provided by (used in) investing activities	1,405	(11,579)	(12,204)
CASH FLOWS FROM FINANCING ACTIVITIES
Net (decrease) increase in deposits	(11,567)	13,136	12,568
Net change in short-term funds borrowed	9,514	(669)	(481)
Cash paid for preferred stock redemption	0	(126)	0
Redemption of long-term debt	(290)	(286)	(429)
Bank common stock repurchased	(202)	(800)	(76)
Proceeds from the issuance of common stock	9	21	8
Dividends paid on common and preferred stock	(269)	(261)	(259)
Other, net	(8)	(13)	(8)
Net cash provided by (used in) financing activities	(2,813)	11,002	11,323
Net increase (decrease) in cash and due from banks	62	52	(162)
Cash and due from banks at beginning of year	595	543	705
Cash and due from banks at end of year	657	595	543
Cash paid for interest	160	81	195
Net cash paid for income taxes	21	442	169
Noncash activities:
Loans held for investment transferred to other real estate owned	0	25	4
Loans held for investment reclassified to loans held for sale, net	114	120	(11)
Investment securities available-for-sale transferred to held-to-maturity, at amortized cost (fair value $10,691)	13,097	0	0
Deposits acquired in purchase of Nevada branches	430	0	0
Loans acquired in purchase of Nevada branches, net	$ 95	$ 0	$ 0