Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Interest and fees on loans and leases	$ 5,347	$ 5,163	$ 5,603
Interest and dividends on securities	941	939	871
Interest on other earning assets	39	40	33
Total interest income	6,327	6,142	6,507
Interest Expense
Interest on deposits	233	239	301
Interest on short-term borrowings	4	4	6
Interest on long-term debt	498	525	584
Total interest expense	735	768	891
Net Interest Income	5,592	5,374	5,616
Provision for credit losses	428	251	592
Net Interest Income After Provision for Credit Losses	5,164	5,123	5,024
Noninterest Income
Insurance income	1,596	1,643	1,517
Service charges on deposits	631	632	619
Mortgage banking income	455	395	565
Investment banking and brokerage fees and commissions	398	387	383
Trust and investment advisory revenues	240	221	200
Bankcard fees and merchant discounts	218	207	202
Checkcard fees	174	163	157
Operating lease income	124	95	77
Income from bank-owned life insurance	113	110	113
FDIC loss share income, net	(253)	(343)	(293)
Other income	326	349	445
Securities gains (losses), net
Gross realized gains	41	7	57
Gross realized losses	(40)	(4)	(6)
OTTI charges	(2)	(23)	0
Non-credit portion recognized in OCI	(2)	17	0
Total securities gains (losses), net	(3)	(3)	51
Total noninterest income	4,019	3,856	4,036
Noninterest Expense
Personnel expense	3,469	3,180	3,293
Occupancy and equipment expense	708	682	692
Software expense	192	174	158
Loan-related expense	150	267	188
Outside IT services	135	115	89
Professional services	130	139	189
Amortization of intangibles	105	91	106
Regulatory charges	101	106	143
Foreclosed property expense	53	40	55
Merger-related and restructuring charges, net	165	46	46
Loss on early extinguishment of debt	172	122	0
Other expense	886	890	818
Total noninterest expense	6,266	5,852	5,777
Earnings
Income before income taxes	2,917	3,127	3,283
Provision for income taxes	794	921	1,553
Net income	2,123	2,206	1,730
Noncontrolling interests	39	75	50
Dividends on preferred stock	148	148	117
Net income available to common shareholders	$ 1,936	$ 1,983	$ 1,563
Basic EPS	$ 2.59	$ 2.76	$ 2.22
Diluted EPS	2.56	2.72	2.19
Cash dividends declared	$ 1.05	$ 0.95	$ 0.92
Basic weighted average shares outstanding	748,010	718,140	703,042
Diluted weighted average shares outstanding	757,765	728,372	714,363