Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income (loss)	$ 1,382	$ 1,101
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	187	180
Depreciation and amortization expense, net	290	301
Accretion of acquired loans	69	171
Increase in cash surrender value of corporate-owned life insurance	(84)	(85)
Stock-based compensation expense	78	74
FDIC reimbursement (payments), net of FDIC expense	2	(2)
Deferred income taxes (benefit)	103	134
Proceeds from sales of loans held for sale	8,234	8,109
Originations of loans held for sale, net of repayments	(8,631)	(8,287)
Net losses (gains) on sales of loans held for sale	(130)	(111)
Net losses (gains) and writedown on OREO	(2)	3
Net losses (gains) on leased equipment	(34)	2
Net securities losses (gains)	0	(1)
Net losses (gains) on sales of fixed assets	8	16
Net decrease (increase) in trading account assets	(122)	84
Gain on sale of KIBS	(83)	0
Other operating activities, net	(473)	(610)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	794	1,079
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	0	(74)
Proceeds from sale of KIBS	124	0
Net decrease (increase) in short-term investments, excluding acquisitions	2,175	(1,218)
Purchases of securities available for sale	(3,058)	(2,725)
Proceeds from sales of securities available for sale	0	914
Proceeds from prepayments and maturities of securities available for sale	2,456	3,038
Proceeds from prepayments and maturities of held-to-maturity securities	1,206	1,350
Purchases of held-to-maturity securities	(1,242)	(1,395)
Purchases of other investments	(21)	(78)
Proceeds from sales of other investments	36	99
Proceeds from prepayments and maturities of other investments	37	2
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(3,249)	(896)
Proceeds from sales of portfolio loans	143	129
Proceeds from corporate-owned life insurance	60	40
Purchases of premises, equipment, and software	(73)	(56)
Proceeds from sales of premises and equipment	1	0
Proceeds from sales of OREO	22	37
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(1,383)	(833)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	545	(641)
Net increase (decrease) in short-term borrowings	911	(1,322)
Net proceeds from issuance of long-term debt	1,802	2,850
Payments on long-term debt	(2,127)	(43)
Issuance of preferred shares	412	0
Open market Common Share repurchases	(820)	(466)
Employee equity compensation program Common Share repurchases	(47)	(65)
Redemption of Preferred Stock Series C	0	(350)
Net proceeds from reissuance of Common Shares	19	29
Cash dividends paid	(458)	(353)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	237	(361)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(352)	(115)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	671	677
CASH AND DUE FROM BANKS AT END OF PERIOD	319	562
Additional disclosures relative to cash flows:
Interest paid	632	442
Income taxes paid (refunded)	22	3
Noncash items:
Reduction of secured borrowing and related collateral	18	33
Loans transferred to portfolio from held for sale	21	93
Loans transferred to held for sale from portfolio	7	41
Loans transferred to OREO	$ 19	$ 29