Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 916	$ 255
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(301)	481
Depreciation and amortization	(22)	75
Share-based compensation	23	22
Deferred income tax expense (benefit)	108	(97)
Net decrease in trading securities	(39)	(16)
Net decrease (increase) in loans held for sale	13	(2)
Change in other liabilities	14	31
Change in other assets	(177)	(185)
Other, net	(72)	(16)
Net cash provided by operating activities	463	548
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in money market investments	(4,461)	(2,433)
Proceeds from maturities and paydowns of investment securities held-to-maturity	433	250
Purchases of investment securities held-to-maturity	(256)	(250)
Proceeds from sales, maturities and paydowns of investment securities available-for-sale	3,611	3,198
Purchases of investment securities available-for-sale	(8,730)	(3,907)
Net change in loans and leases	2,957	(6,004)
Purchases and sales of other noninterest-bearing investments	18	56
Purchases of premises and equipment	(153)	(123)
Other, net	8	32
Net cash used in investing activities	(6,573)	(9,181)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	8,230	10,008
Net change in short-term funds borrowed	(993)	(801)
Cash paid for preferred stock redemption	(126)	0
Redemption of long-term debt	(281)	(429)
Proceeds from the issuance of common stock	17	5
Dividends paid on common and preferred stock	(199)	(195)
Bank common stock repurchased	(475)	(76)
Other, net	(9)	(8)
Net cash provided by financing activities	6,164	8,504
Net increase (decrease) in cash and due from banks	54	(129)
Cash and due from banks at beginning of period	543	705
Cash and due from banks at end of period	597	576
Cash paid for interest	61	164
Net cash paid for income taxes	442	148
Noncash activities are summarized as follows:
Loans held for investment transferred to other real estate owned	22	2
Loans held for investment reclassified to loans held for sale, net	$ 55	$ (21)