CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Interest and fees on loans and leases		$ 4,424	$ 5,051	$ 4,078
Interest on securities		1,119	1,162	1,080
Interest on other short-term investments		29	41	25
Total interest income		5,572	6,254	5,183
Interest Expense
Interest on deposits		322	892	538
Interest on federal funds purchased		2	29	30
Interest on other short-term borrowings		14	28	29
Interest on long-term debt		452	508	446
Total interest expense		790	1,457	1,043
Net Interest Income		4,782	4,797	4,140
Provision for credit losses		1,097	471	207
Net Interest Income After Provision for Credit Losses		3,685	4,326	3,933
Noninterest Income:
Service charges on deposits	[1]	559	565	549
Commercial banking revenue	[1]	528	460	408
Wealth and asset management revenue	[1]	520	487	444
Card and processing revenue	[1]	352	360	329
Mortgage banking net revenue	[1]	320	287	212
Leasing business revenue	[1]	276	270	114
Other noninterest income	[1]	211	1,064	803
Securities gains (losses), net	[1]	62	40	(54)
Securities gains (losses), net - non-qualifying hedges on mortgage servicing rights	[1]	2	3	(15)
Total noninterest income	[1]	2,830	3,536	2,790
Noninterest Expense:
Compensation and benefits	[1]	2,590	2,418	2,115
Technology and communications	[1]	362	422	285
Net occupancy expense	[1]	350	332	292
Leasing business expense	[1]	140	133	76
Equipment expense	[1]	130	129	123
Card and processing expense	[1]	121	130	123
Marketing expense	[1]	104	162	147
Other noninterest expense	[1]	921	934	797
Total noninterest expense	[1]	4,718	4,660	3,958
Income before income taxes		1,797	3,202	2,765
Applicable income tax expense		370	690	572
Net Income		1,427	2,512	2,193
Dividends on preferred stock		104	93	75
Net Income Available to Common Shareholders		$ 1,323	$ 2,419	$ 2,118
Shares Disclosures
Earnings per share - basic (in usd per share)		$ 1.84	$ 3.38	$ 3.11
Earnings per share - diluted (in usd per share)		$ 1.83	$ 3.33	$ 3.06
Average common shares outstanding - basic (in shares)		714,729,585	710,433,611	673,346,168
Average common shares outstanding - diluted (in shares)		719,735,415	720,065,498	685,488,498

[1] During the first quarter of 2020, certain noninterest income and noninterest expense line items were reclassified to better align disclosures to business activities. These reclassifications were retrospectively applied to all prior periods presented. Total noninterest income and noninterest expense did not change as a result of these reclassifications.