Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 1,351	$ 333
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	(315)	841
Depreciation and amortization expense, net	21	86
Accretion of acquired loans	13	18
Increase in cash surrender value of corporate-owned life insurance	(54)	(58)
Stock-based compensation expense	52	51
Deferred income taxes (benefit)	196	(148)
Proceeds from sales of loans held for sale	7,629	6,437
Originations of loans held for sale, net of repayments	(7,494)	(6,816)
Net losses (gains) on sales of loans held for sale	(120)	(109)
Net losses (gains) on leased equipment	(6)	(16)
Net securities losses (gains)	0	(4)
Net losses (gains) on sales of fixed assets	7	3
Net decrease (increase) in trading account assets	(116)	395
Net transfers of loans held for sale	26	0
Other operating activities, net	(942)	(908)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	248	105
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(9)	0
Net decrease (increase) in short-term investments, excluding acquisitions	(4,266)	(12,764)
Purchases of securities available for sale	(11,978)	(4,567)
Proceeds from sales of securities available for sale	0	583
Proceeds from prepayments and maturities of securities available for sale	4,286	2,933
Proceeds from prepayments and maturities of held-to-maturity securities	1,427	998
Purchases of held-to-maturity securities	(3)	(5)
Purchases of other investments	(19)	(96)
Proceeds from sales of other investments	26	26
Proceeds from prepayments and maturities of other investments	6	11
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	575	(11,967)
Proceeds from sales of portfolio loans	(163)
Proceeds from sales of portfolio loans		91
Proceeds from corporate-owned life insurance	36	40
Purchases of premises, equipment, and software	(32)	(27)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(10,114)	(24,744)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	10,790	23,643
Net increase (decrease) in short-term borrowings	(45)	891
Net proceeds from issuance of long-term debt	1,200	2,501
Payments on long-term debt	(1,518)	(1,507)
Open market Common Share repurchases	(435)	(117)
Employee equity compensation program Common Share repurchases	(32)	(36)
Net proceeds from reissuance of Common Shares	20	6
Cash dividends paid	(413)	(415)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	9,567	24,966
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(299)	327
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	1,091	732
CASH AND DUE FROM BANKS AT END OF PERIOD	792	1,059
Additional disclosures relative to cash flows:
Interest paid	200	465
Income taxes paid (refunded)	191	59
Noncash items:
Reduction of secured borrowing and related collateral	2	3
Loans transferred to portfolio from held for sale	86	25
Loans transferred to held for sale from portfolio	97	210
Loans transferred to OREO	2	93
CMBS risk retentions	0	27
ABS risk retentions	$ 14	$ 9