Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest and Fee Income, Loans and Leases	$ 469	$ 434	$ 902	$ 854
Interest Income, Money Market Deposits	5	5	9	13
Interest income:
Investment Income, Interest	84	48	162	95
Interest expense:
Interest Income (Expense), Net	528	465	1,017	918
Provision for loan losses	7	35	30	77
Net interest income after provision for loan losses	521	430	987	841
Noninterest income:
Other	(1)	(1)	(1)	(1)
Noninterest expense:
Other real estate expense, net	0	(1)	0	(2)
Credit And Collection Services	8	6	16	12
Provision for unfunded lending commitments	(3)	4	2	10
Noninterest Expense	405	382	819	777
Income (Loss) from Continuing Operations before Income Taxes, Domestic	248	174	432	306
Income taxes	80	60	124	102
Net income	168	114	308	204
Preferred Stock Redemption	(2)	(10)	(2)	(10)
Net Income (Loss) Available to Common Stockholders, Basic	154	91	283	169
Net earnings per common share:
Interest and Dividend Income, Operating	558	487	1,073	962
Interest Expense, Deposits	14	12	28	24
Interest Expense, Debt	16	10	28	20
Interest Expense	30	22	56	44
Fees and Commissions, Depositor Accounts	43	42	85	83
Fees and Commissions, Other	56	52	105	101
Fees and Commissions, Fiduciary and Trust Activities	10	9	20	17
Gain Loss On Sales Of Loans And Servicing Income	6	10	13	18
Brokerage Commissions Revenue	6	5	13	11
Noninterest income, Customer-related Fees	121	118	236	230
Investment Income, Nonoperating	10	6	22	11
Gain (Loss) on Sale of Securities, Net	2	3	7	2
Noninterest Income	132	126	264	242
Labor and Related Expense	242	241	503	500
Occupancy, Net	32	30	66	59
Equipment Expense	32	31	64	62
Professional Fees	13	12	27	24
Advertising Expense	6	5	11	11
Federal Deposit Insurance Corporation Premium Expense	13	10	25	17
Amortization of Intangible Assets	2	2	4	4
Other Noninterest Expense	54	50	105	100
Preferred Stock Dividends, Income Statement Impact	$ 12	$ 13	$ 23	$ 25
Weighted Average Number of Shares Outstanding, Basic	201,822	204,236	202,083	204,113
Weighted Average Number of Shares Outstanding, Diluted	208,183	204,536	209,353	204,317
Earnings Per Share, Basic	$ 0.76	$ 0.44	$ 1.39	$ 0.82
Earnings Per Share, Diluted	$ 0.73	$ 0.44	$ 1.34	$ 0.82