Consolidated Income Statement - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Income
Loans	$ 2,116	$ 2,678	$ 6,853	$ 7,952
Investment securities	490	617	1,599	1,866
Other	70	208	279	610
Total interest income	2,676	3,503	8,731	10,428
Interest Expense
Deposits	74	531	590	1,518
Borrowed funds	118	468	619	1,433
Total interest expense	192	999	1,209	2,951
Net interest income	2,484	2,504	7,522	7,477
Noninterest Income
Total noninterest income	1,797	1,738	5,171	5,041
Other	457	342	1,071	1,017
Total revenue	4,281	4,242	12,693	12,518
Provision for credit losses	52	183	3,429	552
Noninterest Expense
Personnel	1,410	1,400	4,152	4,179
Occupancy	205	206	611	633
Equipment	292	291	880	862
Marketing	67	76	172	224
Other	557	650	1,774	1,914
Total noninterest expense	2,531	2,623	7,589	7,812
Income from continuing operations before income taxes and noncontrolling interests	1,698	1,436	1,675	4,154
Income taxes from continuing operations	166	255	128	706
Net income from continuing operations	1,532	1,181	1,547	3,448
Income from discontinued operations before taxes		251	5,777	700
Income taxes from discontinued operations		40	1,222	111
Net income from discontinued operations		211	4,555	589
Net income	1,532	1,392	6,102	4,037
Less: Comprehensive income attributable to noncontrolling interests	13	13	27	35
Preferred stock dividends	63	63	181	181
Preferred stock discount accretion and redemptions	1	1	3	3
Net income attributable to common shareholders	$ 1,455	$ 1,315	$ 5,891	$ 3,818
Earnings Per Share, Basic [Abstract]
Basic earnings from continuing operations (in dollars per share)	$ 3.40	$ 2.47	$ 3.11	$ 7.15
Basic earnings per common share from discontinued operations (in dollars per share)		0.48	10.61	1.30
Basic earnings per common share (in dollars per share)	3.40	2.95	13.73	8.45
Earnings Per Share, Diluted [Abstract]
Diluted earnings from continuing operations (in dollars per share)	3.39	2.47	3.11	7.13
Diluted earnings per common share from discontinued operations (in dollars per share)		0.47	10.59	1.29
Diluted earnings per common share (in dollars per share)	$ 3.39	$ 2.94	$ 13.70	$ 8.42
Average Common Shares Outstanding
Basic (in shares)	426	444	427	450
Diluted (in shares)	426	445	428	451
Asset management [Member]
Noninterest Income
Total noninterest income	$ 215	$ 213	$ 615	$ 646
Consumer services [Member]
Noninterest Income
Total noninterest income	390	402	1,097	1,165
Corporate services [Member]
Noninterest Income
Total noninterest income	479	469	1,517	1,415
Residential mortgage [Member]
Noninterest Income
Total noninterest income	137	134	505	281
Service charges on deposits [Member]
Noninterest Income
Total noninterest income	$ 119	$ 178	$ 366	$ 517