Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 146	$ 407
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	359	62
Depreciation and amortization expense, net	54	58
Accretion of acquired loans	10	17
Increase in cash surrender value of corporate-owned life insurance	(29)	(28)
Stock-based compensation expense	25	25
Deferred income taxes (benefit)	(18)	99
Proceeds from sales of loans held for sale	2,687	2,045
Originations of loans held for sale, net of repayments	(3,256)	(1,679)
Net losses (gains) on sales of loans held for sale	(38)	(28)
Net losses (gains) on leased equipment	6	2
Net securities losses (gains)	(4)	0
Net losses (gains) on sales of fixed assets	2	(1)
Net decrease (increase) in trading account assets	245	(130)
Other operating activities, net	(362)	(289)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(173)	560
INVESTING ACTIVITIES
Net decrease (increase) in short-term investments, excluding acquisitions	(2,801)	50
Purchases of securities available for sale	(190)	(1,842)
Proceeds from sales of securities available for sale	583	0
Proceeds from prepayments and maturities of securities available for sale	1,176	655
Proceeds from prepayments and maturities of held-to-maturity securities	434	295
Purchases of held-to-maturity securities	(4)	(9)
Purchases of other investments	(91)	(16)
Proceeds from sales of other investments	2	7
Proceeds from prepayments and maturities of other investments	10	32
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(8,902)	(780)
Proceeds from sales of portfolio loans	54	61
Proceeds from corporate-owned life insurance	19	16
Purchases of premises, equipment, and software	(12)	(9)
Proceeds from sales of premises and equipment	0	1
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(9,722)	(1,539)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	3,434	866
Net increase (decrease) in short-term borrowings	5,958	83
Net proceeds from issuance of long-term debt	2,497	1,351
Payments on long-term debt	(1,506)	(1,000)
Open market Common Share repurchases	(117)	(167)
Employee equity compensation program Common Share repurchases	(35)	(32)
Net proceeds from reissuance of Common Shares	5	3
Cash dividends paid	(208)	(192)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	10,028	912
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	133	(67)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	732	678
CASH AND DUE FROM BANKS AT END OF PERIOD	865	611
Additional disclosures relative to cash flows:
Interest paid	267	306
Income taxes paid (refunded)	35	34
Noncash items:
Reduction of secured borrowing and related collateral	1	1
Loans transferred to portfolio from held for sale	10	5
Loans transferred to held for sale from portfolio	210	(10)
Loans transferred to OREO	92	0
CMBS risk retentions	12	9
ABS risk retentions	$ 11	$ 0