Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,129	$ 539	$ 816
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(276)	414	39
Depreciation and amortization	(14)	86	188
Share-based compensation	28	26	27
Deferred income tax expense (benefit)	32	(58)	(2)
Net decrease (increase) in trading securities	(107)	(83)	(76)
Net decrease (increase) in loans held for sale	14	(10)	(84)
Change in other liabilities	13	57	(14)
Change in other assets	(78)	(223)	(179)
Other, net	(112)	(29)	(18)
Net cash provided by operating activities	629	719	697
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	(5,577)	(5,611)	852
Proceeds from maturities and paydowns of investment securities held-to-maturity	457	386	391
Purchases of investment securities held-to-maturity	(262)	(430)	(209)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	4,748	4,339	3,105
Purchases of investment securities available-for-sale	(13,647)	(6,151)	(1,864)
Net change in loans and leases	2,814	(4,687)	(1,957)
Purchases and sales of other noninterest-bearing investments	63	79	172
Purchases of premises and equipment	(206)	(171)	(117)
Other, net	31	42	2
Net cash provided by (used in) investing activities	(11,579)	(12,204)	375
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	13,136	12,568	2,984
Net change in short-term funds borrowed	(669)	(481)	(3,600)
Cash paid for preferred stock redemptions	(126)	0	0
Repayments of long-term debt	(286)	(429)	0
Proceeds from the issuance of long-term debt	0	0	992
Bank common stock repurchased	(800)	(76)	(1,102)
Proceeds from the issuance of common stock	21	8	14
Dividends paid on common and preferred stock	(261)	(259)	(260)
Other, net	(13)	(8)	(9)
Net cash provided by (used in) financing activities	11,002	11,323	(981)
Net increase (decrease) in cash and due from banks	52	(162)	91
Cash and due from banks at beginning of year	543	705	614
Cash and due from banks at end of year	595	543	705
Cash paid for interest	81	195	401
Net cash paid for income taxes	442	169	233
Noncash activities are summarized as follows:
Loans held for investment transferred to other real estate owned	25	4	12
Loans held for investment reclassified to loans held for sale, net	$ 120	$ (11)	$ 85