Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income
Interest and fees on loans and leases	$ 7,982	$ 6,894	$ 6,230
Interest on securities	1,319	1,160	1,092
Interest on other earning assets	108	66	52
Total interest income	9,409	8,120	7,374
Interest Expense
Interest on deposits	1,101	644	344
Interest on long-term debt	797	683	454
Interest on other borrowings	198	111	41
Total interest expense	2,096	1,438	839
Net Interest Income	7,313	6,682	6,535
Provision for credit losses	615	566	547
Net Interest Income After Provision for Credit Losses	6,698	6,116	5,988
Noninterest Income
Total noninterest income	5,255	4,876	4,782
Noninterest Expense
Personnel expense	4,833	4,313	4,226
Net occupancy expense	507	491	538
Professional fees and outside processing	433	365	369
Software expense	338	272	242
Equipment expense	280	267	246
Marketing and customer development	137	102	94
Operating lease depreciation	136	120	120
Loan-related expense	123	108	130
Amortization of intangibles	164	131	142
Regulatory charges	81	134	153
Merger-related and restructuring charges	360	146	115
Loss (gain) on early extinguishment of debt	0	0	392
Other expense	542	483	677
Total noninterest expense	7,934	6,932	7,444
Earnings
Income before income taxes	4,019	4,060	3,326
Provision for income taxes	782	803	911
Net income	3,237	3,257	2,415
Noncontrolling interests	13	20	21
Dividends on preferred stock	196	174	174
Net income available to common shareholders	$ 3,028	$ 3,063	$ 2,220
Basic EPS	$ 3.76	$ 3.96	$ 2.78
Diluted EPS	$ 3.71	$ 3.91	$ 2.74
Basic weighted average shares outstanding (in shares)	805,104	772,963	799,217
Diluted weighted average shares outstanding (in shares)	815,204	783,484	810,977
Insurance income
Noninterest Income
Total noninterest income	$ 2,072	$ 1,852	$ 1,754
Service charges on deposits
Noninterest Income
Total noninterest income	762	712	706
Wealth management income
Noninterest Income
Total noninterest income	715	660	594
Card and payment related fees
Noninterest Income
Total noninterest income	555	522	501
Residential mortgage income
Noninterest Income
Total noninterest income	285	258	309
Investment banking and trading income
Noninterest Income
Total noninterest income	244	154	203
Operating lease income
Noninterest Income
Total noninterest income	153	145	146
Income from bank-owned life insurance
Noninterest Income
Total noninterest income	129	116	122
Lending related fees
Noninterest Income
Total noninterest income	124	99	101
Commercial real estate related income
Noninterest Income
Total noninterest income	116	100	106
Securities gains (losses)
Noninterest Income
Total noninterest income	(116)	3	(1)
Other income
Noninterest Income
Total noninterest income	$ 216	$ 255	$ 241