Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income (loss)	$ 920	$ 907	$ 910
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	166	57	138
Provision (credit) for losses on LIHTC guaranteed funds		(7)	4
Depreciation, amortization and accretion expense, net	247	246	221
Increase in cash surrender value of corporate-owned life insurance	(108)	(106)	(106)
Stock-based compensation expense	58	44	35
FDIC reimbursement (payments), net of FDIC expense		1	296
Deferred income taxes (benefit)	(76)	5	29
Proceeds from sales of loans held for sale	7,333	5,386	5,595
Originations of loans held for sale, net of repayments	(7,072)	(5,415)	(5,440)
Net losses (gains) from sale of loans held for sale	(103)	(97)	(115)
Net losses (gains) from principal investing	(51)	(78)	(52)
Net losses (gains) and writedown on OREO	4	3	6
Net losses (gains) on leased equipment	(6)	(35)	(43)
Net losses (gains) on sales of fixed assets	8	7	12
Net securities losses (gains)			(1)
Net decrease (increase) in trading account assets	(38)	(12)	(133)
Gain on sale of Victory		(10)	(146)
Loss on sale of residual interests and deconsolidation of securitization trusts		40
Other operating activities, net	(151)	384	337
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,131	1,320	1,547
INVESTING ACTIVITIES
Net decrease (increase) in short-term investments, excluding acquisitions	1,562	1,358	(1,650)
Purchases of securities available for sale	(4,090)	(3,797)	(5,222)
Proceeds from sales of securities available for sale	19		35
Proceeds from prepayments and maturities of securities available for sale	3,098	2,860	4,470
Proceeds from prepayments and maturities of held-to-maturity securities	1,102	850	847
Purchases of held-to-maturity securities	(988)	(1,109)	(1,672)
Purchases of other investments	(32)	(49)	(46)
Proceeds from sales of other investments	145	334	187
Proceeds from prepayments and maturities of other investments	8	4	6
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(2,951)	(3,296)	(2,026)
Proceeds from sales of portfolio loans	110	120	185
Proceeds from corporate-owned life insurance	46	35	31
Purchases of premises, equipment, and software	(75)	(97)	(100)
Proceeds from sales of premises and equipment	1	1	8
Proceeds from sales of OREO	22	17	23
Cash received (used) in acquisitions, net of cash acquired		(114)	601
Proceeds from sale of residual interests		57
Proceeds from sale of Victory		10	131
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(2,023)	(2,816)	(4,192)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	(952)	2,736	2,333
Net increase (decrease) in short-term borrowings	(93)	(879)	(18)
Net proceeds from issuance of long-term debt	3,756	1,727	2,573
Payments on long-term debt	(1,172)	(1,355)	(1,545)
Repurchase of common shares	(448)	(484)	(474)
Net proceeds from reissuance of common shares	22	27	26
Cash dividends paid	(267)	(240)	(217)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	846	1,532	2,678
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(46)	36	33
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	653	617	584
CASH AND DUE FROM BANKS AT END OF YEAR	607	653	617
Additional disclosures relative to cash flows:
Interest paid	329	298	304
Income taxes paid (refunded)	281	131	185
Noncash items:
Reduction of secured borrowing and related collateral	160	152
Loans transferred to portfolio from held for sale	1	19	9
Loans transferred to held for sale from portfolio	63	16	61
Loans transferred to other real estate owned	$ 20	23	21
Assets acquired		41	$ 41
Liabilities assumed		17
LIHTC guaranteed funds put		$ 7