Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest Income (Expense), Net [Abstract]
Interest and Fees and Loans	$ 581	$ 514	$ 1,151	$ 1,011
Interest on Money Market Investments	8	7	17	13
Interest on Securities	95	85	191	170
Total Interest Income	684	606	1,359	1,194
Interest Expense [Abstract]
Interest on Deposits	66	29	123	48
Interest on short- and long-term borrowings	49	29	91	56
Total Interest Expense	115	58	214	104
Net interest income	569	548	1,145	1,090
Provision for loan losses	20	5	22	(35)
Provision for unfunded lending commitments	1	7	3	0
Provision for Credit Losses	21	12	25	(35)
Net interest income after provision for loan losses	548	536	1,120	1,125
Noninterest income:
Capital Markets and Foreign Exchange Gain (Loss)	9	7	16	15
Other service charges, commissions, and fees	58	55	113	110
Wealth management and trust income	13	14	26	25
Loan Sales and Servicing Income	9	7	14	13
Customer-related Fees	130	125	250	247
Dividends and Other Investment Income	9	11	18	22
Securities Gains, Net	(3)	1	(2)	1
Noninterest Income, Other Operating Income	(4)	1	(2)	6
Noninterest Income	132	138	264	276
Noninterest expense:
Salaries and Employee Benefits	274	266	562	535
Occupancy, Net	32	32	65	63
Furniture, Equipment, and Software, Net	35	32	67	65
Other real estate expense, net	0	0	1	(1)
Credit-Related Expense	8	7	13	13
Professional and Legal Fees	13	14	23	26
Advertising	5	7	11	13
FDIC Premiums	6	14	12	26
Other	51	49	102	98
Total Noninterest Expense	424	421	854	840
Income Before Income Taxes	256	253	530	561
Income taxes	58	56	119	126
Net income	198	197	411	435
Preferred Stock Dividends	(9)	(10)	(17)	(17)
Net Earnings Available to Common Shareholders	$ 189	$ 187	$ 394	$ 418
Weighted average common shares outstanding during the period:
Weighted Average Number of Shares Outstanding, Basic	179,156	195,583	181,946	196,149
Weighted Average Number of Shares Outstanding, Diluted	189,098	209,247	192,206	209,859
Earnings Per Share, Basic	$ 1.05	$ 0.95	$ 2.15	$ 2.11
Earnings Per Share, Diluted	$ 0.99	$ 0.89	$ 2.04	$ 1.97