Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income (loss)	$ 737	$ 389
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	129	141
Depreciation and amortization expense, net	198	124
Accretion of acquired loans	133	0
Increase in cash surrender value of corporate-owned life insurance	(56)	(49)
Stock-based compensation expense	51	36
FDIC reimbursement (payments), net of FDIC expense	(2)	0
Deferred income taxes (benefit)	212	27
Proceeds from sales of loans held for sale	4,881	2,940
Originations of loans held for sale, net of repayments	(5,435)	(2,691)
Net losses (gains) on sales of loans held for sale	(74)	(31)
Net losses (gains) from principal investing	(1)	(11)
Net losses (gains) and writedown on OREO	2	2
Net losses (gains) on leased equipment	(9)	1
Net securities losses (gains)	(1)	0
Net losses (gains) on sales of fixed assets	14	3
Net decrease (increase) in trading account assets	(214)	(177)
Other operating activities, net	(1,154)	20
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(589)	724
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(74)	0
Net decrease (increase) in short-term investments, excluding acquisitions	253	(3,892)
Purchases of securities available for sale	(723)	(1,614)
Proceeds from sales of securities available for sale	915	0
Proceeds from prepayments and maturities of securities available for sale	2,036	1,565
Proceeds from prepayments and maturities of held-to-maturity securities	890	586
Purchases of held-to-maturity securities	(1,297)	(523)
Purchases of other investments	(69)	(24)
Proceeds from sales of other investments	70	77
Proceeds from prepayments and maturities of other investments	2	1
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(832)	(2,429)
Proceeds from sales of portfolio loans	77	72
Proceeds from corporate-owned life insurance	25	22
Purchases of premises, equipment, and software	(24)	(30)
Proceeds from sales of premises and equipment	0	0
Proceeds from sales of OREO	19	7
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,268	(6,182)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	(1,266)	4,279
Net increase (decrease) in short-term borrowings	394	142
Net proceeds from issuance of long-term debt	950	1,578
Payments on long-term debt	(17)	(509)
Open market common share repurchases	(196)	0
Employee equity compensation program common share repurchases	(59)	0
Redemption of Preferred Stock Series C	(350)	0
Net proceeds from reissuance of common shares	25	3
Cash dividends paid	(236)	(146)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(755)	5,347
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(76)	(111)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	677	607
CASH AND DUE FROM BANKS AT END OF PERIOD	601	496
Additional disclosures relative to cash flows:
Interest paid	281	190
Income taxes paid (refunded)	60	59
Noncash items:
Reduction of secured borrowing and related collateral	21	33
Loans transferred to portfolio from held for sale	19	6
Loans transferred to held for sale from portfolio	29	28
Loans transferred to OREO	$ 19	$ 10