Segment Reporting (Segment Reporting Table) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 2,856	$ 2,484	$ 7,785	$ 7,522
Noninterest income	2,341	1,797	6,299	5,171
Total revenue	5,197	4,281	14,084	12,693
Provision for (recapture of) credit losses	(203)	52	(452)	3,429
Depreciation and amortization	277	246	767	737
Other noninterest expense	3,310	2,285	8,444	6,852
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests	1,813	1,698	5,325	1,675
Income taxes (benefit)	323	166	906	128
Net income from continuing operations	1,490	1,532	4,419	1,547
Less: Net income attributable to noncontrolling interests	16	13	38	27
Net income (loss) from continuing operations excluding noncontrolling interests	1,474	1,519	4,381	1,520
Average Assets	559,242	462,139	510,964	444,029
Retail Banking
Segment Reporting Information [Line Items]
Net interest income			4,572	4,229
Noninterest income	662	673	2,022	2,046
Total revenue			6,594	6,275
Provision for (recapture of) credit losses			(156)	1,049
Depreciation and amortization			214	188
Other noninterest expense			4,828	4,349
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests			1,708	689
Average Assets			103,820	98,764
Retail Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,713	1,383
Noninterest income	662	673
Total revenue	2,375	2,056
Provision for (recapture of) credit losses	(113)	(157)
Depreciation and amortization	78	64
Other noninterest expense	1,811	1,448
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests	599	701
Income taxes (benefit)	140	162	396	161
Net income from continuing operations	459	539	1,312	528
Less: Net income attributable to noncontrolling interests	12	9	26	20
Net income (loss) from continuing operations excluding noncontrolling interests	447	530	1,286	508
Average Assets	117,394	98,731
Corporate & Institutional Banking
Segment Reporting Information [Line Items]
Net interest income			3,315	3,014
Noninterest income	1,056	723	2,730	2,143
Total revenue			6,045	5,157
Provision for (recapture of) credit losses			(277)	2,254
Depreciation and amortization			152	149
Other noninterest expense			2,352	1,906
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests			3,818	848
Average Assets			184,964	185,001
Corporate & Institutional Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,241	1,012
Noninterest income	1,056	723
Total revenue	2,297	1,735
Provision for (recapture of) credit losses	(99)	211
Depreciation and amortization	54	50
Other noninterest expense	926	613
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests	1,416	861
Income taxes (benefit)	290	188	818	160
Net income from continuing operations	1,126	673	3,000	688
Less: Net income attributable to noncontrolling interests	3	3	10	6
Net income (loss) from continuing operations excluding noncontrolling interests	1,123	670	2,990	682
Average Assets	202,268	183,266
Asset Management Group
Segment Reporting Information [Line Items]
Net interest income			346	266
Noninterest income	256	221	729	629
Total revenue			1,075	895
Provision for (recapture of) credit losses			8	23
Depreciation and amortization			16	34
Other noninterest expense			660	613
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests			391	225
Average Assets			11,124	8,041
Asset Management Group | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	141	89
Noninterest income	256	221
Total revenue	397	310
Provision for (recapture of) credit losses	(6)	(19)
Depreciation and amortization	7	11
Other noninterest expense	248	200
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests	148	118
Income taxes (benefit)	34	27	91	52
Net income from continuing operations	114	91	300	173
Less: Net income attributable to noncontrolling interests
Net income (loss) from continuing operations excluding noncontrolling interests	114	91	300	173
Average Assets	13,805	8,361
Other
Segment Reporting Information [Line Items]
Net interest income	(239)		(448)	13
Noninterest income	367	180	818	353
Total revenue	128	180	370	366
Provision for (recapture of) credit losses	15	17	(27)	103
Depreciation and amortization	138	121	385	366
Other noninterest expense	325	24	604	(16)
Income (loss) from continuing operations before income taxes (benefit) and noncontrolling interests	(350)	18	(592)	(87)
Income taxes (benefit)	(141)	(211)	(399)	(245)
Net income from continuing operations	(209)	229	(193)	158
Less: Net income attributable to noncontrolling interests	1	1	2	1
Net income (loss) from continuing operations excluding noncontrolling interests	(210)	228	(195)	157
Average Assets	$ 225,775	$ 171,781	$ 211,056	$ 152,223