Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 884	$ 592	$ 469
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(40)	17	83
Depreciation and amortization	193	179	123
Share-based compensation	26	25	26
Securities gains, net	(1)	(14)	(7)
Deferred income tax expense (benefit)	0	154	(8)
Net decrease (increase) in trading securities	42	(33)	(67)
Net decrease (increase) in loans held for sale	9	97	1
Change in other liabilities	74	29	1
Change in other assets	14	(89)	(10)
Other, net	(25)	(29)	(15)
Net cash provided by operating activities	1,176	928	596
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	(784)	683	4,749
Proceeds from maturities and paydowns of investment securities held-to-maturity	361	314	94
Purchases of investment securities held-to-maturity	(365)	(216)	(416)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	3,061	2,412	3,787
Purchases of investment securities available-for-sale	(2,927)	(4,719)	(9,359)
Net change in loans and leases	(1,943)	(2,135)	(2,102)
Purchases and sales of other noninterest-bearing investments	14	(105)	(20)
Purchases of premises and equipment	(129)	(169)	(196)
Proceeds from sales of other real estate owned	6	8	20
Other, net	0	(8)	(7)
Net cash used in investing activities	(2,706)	(3,919)	(3,436)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	1,484	(614)	2,883
Net change in short-term funds borrowed	2,677	2,149	480
Proceeds from debt over 90 days and up to one year	0	5,100	0
Repayments of debt over 90 days and up to one year	(2,000)	(3,100)	0
Cash paid for preferred stock redemption	0	(144)	(126)
Repayments of Long-term Debt	162	153	280
Proceeds from the issuance of long-term debt	497	0	0
Bank common stock repurchased	(684)	(332)	(97)
Proceeds from Issuance of common stock	20	25	25
Dividends paid on common and preferred stock	(236)	(129)	(108)
Other, net	0	0	2
Net cash provided by financing activities	1,596	2,802	2,779
Net increase (decrease) in cash and due from banks	66	(189)	(61)
Cash and due from banks at beginning of year	548	737	798
Cash and due from banks at end of year	614	548	737
Cash paid for Interest	237	118	83
Net cash paid for income taxes	207	246	214
Loans held for investment transfered to other real estate owned	8	6	15
Loans held for investment reclassified to loans held for sale, net	$ 111	$ 25	$ 50