Segment Reporting (Segment Reporting Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 2,527	$ 2,498	$ 5,038	$ 4,973
Noninterest income	1,549	1,717	3,374	3,303
Total revenue	4,076	4,215	8,412	8,276
Provision for credit losses	2,463	180	3,377	369
Depreciation and amortization	251	257	491	491
Other noninterest expense	2,264	2,354	4,567	4,698
Income (loss) from continuing operations before income taxes and noncontrolling interests	(902)	1,424	(23)	2,718
Income taxes (benefit)	(158)	239	(38)	451
Net income (loss) from continuing operations	(744)	1,185	15	2,267
Average Assets	457,313	396,962	434,874	391,461
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,390	1,376	2,846	2,725
Noninterest income	585	657	1,373	1,252
Total revenue	1,975	2,033	4,219	3,977
Provision for credit losses	761	81	1,206	209
Depreciation and amortization	67	59	124	110
Other noninterest expense	1,433	1,468	2,912	2,885
Income (loss) from continuing operations before income taxes and noncontrolling interests	(286)	425	(23)	773
Income taxes (benefit)	(63)	100	(1)	184
Net income (loss) from continuing operations	(223)	325	(22)	589
Average Assets	102,103	92,350	99,583	91,805
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,052	897	2,002	1,774
Noninterest income	726	661	1,420	1,237
Total revenue	1,778	1,558	3,422	3,011
Provision for credit losses	1,585	100	2,043	171
Depreciation and amortization	51	50	99	100
Other noninterest expense	622	648	1,296	1,284
Income (loss) from continuing operations before income taxes and noncontrolling interests	(480)	760	(16)	1,456
Income taxes (benefit)	(122)	158	(28)	302
Net income (loss) from continuing operations	(358)	602	12	1,154
Average Assets	199,254	163,897	185,878	160,551
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	89	68	177	138
Noninterest income	204	286	408	503
Total revenue	293	354	585	641
Provision for credit losses	39		42	(1)
Depreciation and amortization	12	28	23	40
Other noninterest expense	205	221	413	439
Income (loss) from continuing operations before income taxes and noncontrolling interests	37	105	107	163
Income taxes (benefit)	9	25	25	38
Net income (loss) from continuing operations	28	80	82	125
Average Assets	7,958	7,150	7,880	7,204
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(4)	157	13	336
Noninterest income	34	113	173	311
Total revenue	30	270	186	647
Provision for credit losses	78	(1)	86	(10)
Depreciation and amortization	121	120	245	241
Other noninterest expense	4	17	(54)	90
Income (loss) from continuing operations before income taxes and noncontrolling interests	(173)	134	(91)	326
Income taxes (benefit)	18	(44)	(34)	(73)
Net income (loss) from continuing operations	(191)	178	(57)	399
Average Assets	$ 147,998	$ 133,565	$ 141,533	$ 131,901