Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Real Estate Owned, Transfer to Real Estate Owned	$ 2	$ 6
Transfer of Portfolio Loans and Leases to Held-for-sale	(35)	(2)
Available for sale securities purchased, not settled	56	0
Held to Maturity Securities Purchased, Not Settled	31	0
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	139	91
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	18	36
Depreciation and amortization	37	25
Share-based Compensation	12	11
Deferred income tax expense (benefit)	13	(5)
Net decrease (increase) in trading securities	76	(18)
Net decrease (increase) in loans held for sale	36	39
Change in other liabilities	42	18
Change in other assets	21	7
Other, net	(14)	3
Net cash provided by operating activities	380	207
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	(145)	2,102
Proceeds from maturities and paydowns of investment securities held-to-maturity	91	22
Purchases of investment securities held-to-maturity	(7)	(108)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	530	2,098
Purchases of investment securities available-for-sale	(3,113)	(3,123)
Net change in loans held for investment	(117)	(793)
Net change in other noninterest-bearing investments	(74)	(12)
Purchases of premises and equipment	(50)	(40)
Proceeds from sales of other real estate owned	3	4
Other, net	2	2
Net cash provided by (used in) investing activities	(2,880)	152
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	241	(486)
Net change in short-term funds borrowed	2,311	(115)
Repayments of long-term debt	(153)	(11)
Proceeds from Issuance of Common Stock	9	1
Dividends paid on common and preferred stock	(29)	(27)
Company common stock repurchased and retired	(50)	(1)
Net cash provided by (used in) financing activities	2,329	(639)
Net decrease in cash and due from banks	(171)	(280)
Cash and due from banks at beginning of period	737	798
Cash and due from banks at end of period	566	518
Cash paid for interest	22	18
Net refunds received for income taxes	$ (6)	$ 0