Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Income
Interest and fees on loans and leases	$ 6,894	$ 6,230	$ 5,985
Interest and dividends on securities	1,160	1,092	1,029
Interest on other earning assets	66	52	52
Total interest income	8,120	7,374	7,066
Interest Expense
Interest on deposits	644	344	251
Interest on short-term borrowings	111	41	9
Interest on long-term debt	683	454	485
Total interest expense	1,438	839	745
Net Interest Income	6,682	6,535	6,321
Provision for credit losses	566	547	572
Net Interest Income After Provision for Credit Losses	6,116	5,988	5,749
Noninterest Income
Total noninterest income	4,876	4,782	4,472
Noninterest Expense
Personnel expense	4,313	4,226	4,029
Occupancy and equipment expense	758	784	786
Software expense	272	242	224
Outside IT services	132	160	186
Regulatory charges	134	153	145
Amortization of intangibles	131	142	150
Loan-related expense	108	130	95
Professional services	138	123	102
Merger-related and restructuring charges, net	146	115	171
Loss (gain) on early extinguishment of debt	0	392	(1)
Other expense	800	977	834
Total noninterest expense	6,932	7,444	6,721
Earnings
Income before income taxes	4,060	3,326	3,500
Provision for income taxes	803	911	1,058
Net income	3,257	2,415	2,442
Noncontrolling interests	20	21	16
Dividends on preferred stock	174	174	167
Net income available to common shareholders	$ 3,063	$ 2,220	$ 2,259
Basic EPS (in dollars per share)	$ 3.96	$ 2.78	$ 2.81
Diluted EPS (in dollars per share)	$ 3.91	$ 2.74	$ 2.77
Basic weighted average shares outstanding (in shares)	772,963	799,217	804,680
Diluted weighted average shares outstanding (in shares)	783,484	810,977	814,916
Insurance income
Noninterest Income
Total noninterest income	$ 1,852	$ 1,754	$ 1,713
Service charges on deposits
Noninterest Income
Total noninterest income	712	706	664
Investment banking and brokerage fees and commissions
Noninterest Income
Total noninterest income	477	410	408
Mortgage banking income
Noninterest Income
Total noninterest income	358	415	463
Trust and investment advisory revenues
Noninterest Income
Total noninterest income	285	278	266
Bankcard fees and merchant discounts
Noninterest Income
Total noninterest income	287	271	237
Checkcard fees
Noninterest Income
Total noninterest income	221	214	195
Operating lease income
Noninterest Income
Total noninterest income	145	146	137
Income from bank-owned life insurance
Noninterest Income
Total noninterest income	116	122	123
Other income
Noninterest Income
Total noninterest income	420	467	220
Securities gains (losses), net
Noninterest Income
Total noninterest income	3	(1)	46
Securities gains (losses), net
Gross realized gains	4	17	46
Gross realized losses	$ (1)	$ (18)	$ 0