Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Income
Interest and fees on loans and leases	$ 1,687	$ 1,540	$ 3,292	$ 3,041
Interest and dividends on securities	294	272	585	530
Interest on other earning assets	13	12	38	28
Total interest income	1,994	1,824	3,915	3,599
Interest Expense
Interest on deposits	148	80	266	149
Interest on short-term borrowings	23	5	43	7
Interest on long-term debt	166	104	316	199
Total interest expense	337	189	625	355
Net Interest Income	1,657	1,635	3,290	3,244
Provision for credit losses	135	135	285	283
Net Interest Income After Provision for Credit Losses	1,522	1,500	3,005	2,961
Noninterest Income
Total noninterest income	1,222	1,220	2,402	2,391
Noninterest Expense
Personnel expense	1,074	1,068	2,113	2,103
Occupancy and equipment expense	187	198	381	391
Software expense	67	57	132	115
Outside IT services	32	39	64	88
Regulatory charges	39	36	79	75
Amortization of intangibles	31	36	64	74
Loan-related expense	26	36	55	66
Professional services	32	38	62	60
Merger-related and restructuring charges, net	24	10	52	46
Loss (gain) on early extinguishment of debt	0	0	0	392
Other expense	208	224	404	434
Total noninterest expense	1,720	1,742	3,406	3,844
Earnings
Income before income taxes	1,024	978	2,001	1,508
Provision for income taxes	202	304	388	408
Net income	822	674	1,613	1,100
Noncontrolling interests	3	(1)	6	4
Dividends on preferred stock	44	44	87	87
Net income available to common shareholders	$ 775	$ 631	$ 1,520	$ 1,009
Basic EPS (in dollars per share)	$ 1.00	$ 0.78	$ 1.95	$ 1.25
Diluted EPS (in dollars per share)	0.99	0.77	1.93	1.23
Cash dividends declared per share (in dollars per share)	$ 0.375	$ 0.300	$ 0.750	$ 0.600
Basic weighted average shares outstanding (in shares)	775,836	808,980	777,716	809,439
Diluted weighted average shares outstanding (in shares)	785,750	819,389	788,362	821,072
Insurance income
Noninterest Income
Total noninterest income	$ 481	$ 481	$ 917	$ 939
Service charges on deposits
Noninterest Income
Total noninterest income	179	176	344	344
Mortgage banking income
Noninterest Income
Total noninterest income	94	94	193	197
Investment banking and brokerage fees and commissions
Noninterest Income
Total noninterest income	109	105	222	196
Trust and investment advisory revenues
Noninterest Income
Total noninterest income	72	70	144	138
Bankcard fees and merchant discounts
Noninterest Income
Total noninterest income	72	75	141	134
Checkcard fees
Noninterest Income
Total noninterest income	57	54	109	105
Operating lease income
Noninterest Income
Total noninterest income	36	37	73	73
Income from bank-owned life insurance
Noninterest Income
Total noninterest income	30	32	61	61
Other income
Noninterest Income
Total noninterest income	91	96	197	204
Securities gains (losses), net
Noninterest Income
Total noninterest income	1	0	1	0
Securities gains (losses), net
Gross realized gains	1	0	1	0
Gross realized losses	0	0	0	0
OTTI charges	0	0	0	0
Non-credit portion recognized in OCI	$ 0	$ 0	$ 0	$ 0