Segment Reporting (Segment Reporting Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 2,348	$ 2,511
Noninterest income	1,872	1,825
Total revenue	4,220	4,336
Provision for (recapture of) credit losses	(551)	914
Depreciation and amortization	234	240
Other noninterest expense	2,340	2,303
Income from continuing operations before income taxes and noncontrolling interests	2,197	879
Income taxes (benefit)	371	120
Net income from continuing operations	1,826	759
Less: Net income attributable to noncontrolling interests	10	7
Net income from continuing operations excluding noncontrolling interests	1,816	752
Average Assets	468,220	412,436
Retail Banking
Segment Reporting Information [Line Items]
Noninterest income	654	788
Retail Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,362	1,456
Noninterest income	654	788
Total revenue	2,016	2,244
Provision for (recapture of) credit losses	(257)	445
Depreciation and amortization	63	57
Other noninterest expense	1,413	1,471
Income from continuing operations before income taxes and noncontrolling interests	797	271
Income taxes (benefit)	183	62
Net income from continuing operations	614	209
Less: Net income attributable to noncontrolling interests	7	8
Net income from continuing operations excluding noncontrolling interests	607	201
Average Assets	92,891	97,062
Corporate & Institutional Banking
Segment Reporting Information [Line Items]
Noninterest income	807	694
Corporate & Institutional Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	991	950
Noninterest income	807	694
Total revenue	1,798	1,644
Provision for (recapture of) credit losses	(282)	458
Depreciation and amortization	47	48
Other noninterest expense	664	674
Income from continuing operations before income taxes and noncontrolling interests	1,369	464
Income taxes (benefit)	308	94
Net income from continuing operations	1,061	370
Less: Net income attributable to noncontrolling interests	3
Net income from continuing operations excluding noncontrolling interests	1,058	370
Average Assets	170,531	172,502
Asset Management Group
Segment Reporting Information [Line Items]
Noninterest income	229	204
Asset Management Group | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	93	88
Noninterest income	229	204
Total revenue	322	292
Provision for (recapture of) credit losses	(9)	3
Depreciation and amortization	4	11
Other noninterest expense	198	208
Income from continuing operations before income taxes and noncontrolling interests	129	70
Income taxes (benefit)	30	16
Net income from continuing operations	99	54
Less: Net income attributable to noncontrolling interests
Net income from continuing operations excluding noncontrolling interests	99	54
Average Assets	8,873	7,801
Other
Segment Reporting Information [Line Items]
Net interest income	(98)	17
Noninterest income	182	139
Total revenue	84	156
Provision for (recapture of) credit losses	(3)	8
Depreciation and amortization	120	124
Other noninterest expense	65	(50)
Income from continuing operations before income taxes and noncontrolling interests	(98)	74
Income taxes (benefit)	(150)	(52)
Net income from continuing operations	52	126
Less: Net income attributable to noncontrolling interests		(1)
Net income from continuing operations excluding noncontrolling interests	52	127
Average Assets	$ 195,925	$ 135,071