Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net income (loss)	$ 407	$ 418
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	62	61
Depreciation and amortization expense, net	58	103
Accretion of acquired loans	17	27
Increase in cash surrender value of corporate-owned life insurance	(28)	(28)
Stock-based compensation expense	25	27
FDIC reimbursement (payments), net of FDIC expense	0	1
Deferred income taxes (benefit)	99	22
Proceeds from sales of loans held for sale	2,045	2,748
Originations of loans held for sale, net of repayments	(1,679)	(3,280)
Net losses (gains) on sales of loans held for sale	(28)	(44)
Net losses (gains) and writedown on OREO	1	0
Net losses (gains) on leased equipment	2	3
Net losses (gains) on sales of fixed assets	(1)	0
Net decrease (increase) in trading account assets	(130)	67
Other operating activities, net	(294)	(336)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	556	(211)
INVESTING ACTIVITIES
Net decrease (increase) in short-term investments, excluding acquisitions	51	2,803
Purchases of securities available for sale	(1,842)	(787)
Proceeds from prepayments and maturities of securities available for sale	655	833
Proceeds from prepayments and maturities of held-to-maturity securities	295	398
Purchases of held-to-maturity securities	(9)	(756)
Purchases of other investments	(16)	(4)
Proceeds from sales of other investments	7	10
Proceeds from prepayments and maturities of other investments	32	0
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(780)	(1,793)
Proceeds from sales of portfolio loans	61	38
Proceeds from corporate-owned life insurance	16	18
Purchases of premises, equipment, and software	(9)	(19)
Proceeds from sales of premises and equipment	1	1
Proceeds from sales of OREO	4	7
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(1,534)	749
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	866	(484)
Net increase (decrease) in short-term borrowings	82	738
Net proceeds from issuance of long-term debt	1,351	501
Payments on long-term debt	(1,000)	(1,005)
Open market Common Share repurchases	(167)	(156)
Employee equity compensation program Common Share repurchases	(32)	(43)
Net proceeds from reissuance of Common Shares	3	10
Cash dividends paid	(192)	(127)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	911	(566)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(67)	(28)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	678	671
CASH AND DUE FROM BANKS AT END OF PERIOD	611	643
Additional disclosures relative to cash flows:
Interest paid	305	199
Income taxes paid (refunded)	34	9
Noncash items:
Reduction of secured borrowing and related collateral	1	7
Loans transferred to portfolio from held for sale	5	14
Loans transferred to held for sale from portfolio	(10)	0
Loans transferred to OREO	9	4
CMBS risk retentions	$ 9	$ 0