Consolidated Income Statement - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Income
Loans	$ 2,257	$ 2,672	$ 4,737	$ 5,274
Investment securities	527	629	1,109	1,249
Other	71	196	209	402
Total interest income	2,855	3,497	6,055	6,925
Interest Expense
Deposits	141	515	516	987
Borrowed funds	187	484	501	965
Total interest expense	328	999	1,017	1,952
Net interest income	2,527	2,498	5,038	4,973
Noninterest Income
Total noninterest income	1,549	1,717	3,374	3,303
Other	271	367	614	675
Total revenue	4,076	4,215	8,412	8,276
Provision for credit losses	2,463	180	3,377	369
Noninterest Expense
Personnel	1,373	1,365	2,742	2,779
Occupancy	199	212	406	427
Equipment	301	298	588	571
Marketing	47	83	105	148
Other	595	653	1,217	1,264
Total noninterest expense	2,515	2,611	5,058	5,189
Income (loss) from continuing operations before income taxes and noncontrolling interests	(902)	1,424	(23)	2,718
Income taxes (benefit) from continuing operations	(158)	239	(38)	451
Net income (loss) from continuing operations	(744)	1,185	15	2,267
Income from discontinued operations before taxes	5,596	224	5,777	449
Income taxes from discontinued operations	1,197	35	1,222	71
Net income from discontinued operations	4,399	189	4,555	378
Net income	3,655	1,374	4,570	2,645
Less: Comprehensive income attributable to noncontrolling interests	7	12	14	22
Preferred stock dividends	55	55	118	118
Preferred stock discount accretion and redemptions	1	1	2	2
Net income attributable to common shareholders	$ 3,592	$ 1,306	$ 4,436	$ 2,503
Earnings Per Share, Basic [Abstract]
Basic earnings from continuing operations (in dollars per share)	$ (1.90)	$ 2.47	$ (0.29)	$ 4.68
Basic earnings per common share from discontinued operations (in dollars per share)	10.28	0.42	10.60	0.83
Basic earnings per common share (in dollars per share)	8.40	2.89	10.33	5.51
Earnings Per Share, Diluted [Abstract]
Diluted earnings from continuing operations (in dollars per share)	(1.90)	2.47	(0.29)	4.67
Diluted earnings per common share from discontinued operations (in dollars per share)	10.28	0.41	10.59	0.82
Diluted earnings per common share (in dollars per share)	$ 8.40	$ 2.88	$ 10.32	$ 5.49
Average Common Shares Outstanding
Basic (in shares)	426	451	428	453
Diluted (in shares)	426	452	428	454
Asset management [Member]
Noninterest Income
Total noninterest income	$ 199	$ 221	$ 400	$ 433
Consumer services [Member]
Noninterest Income
Total noninterest income	330	392	707	763
Corporate services [Member]
Noninterest Income
Total noninterest income	512	484	1,038	946
Residential mortgage [Member]
Noninterest Income
Total noninterest income	158	82	368	147
Service charges on deposits [Member]
Noninterest Income
Total noninterest income	$ 79	$ 171	$ 247	$ 339